Common Developmental Delays in Twins

Joe Rawlinson by Joe Rawlinson - October 25, 2023

Common developmental delays in twins can make it seem like your twins aren’t progressing as you’d expect or when compared to siblings or peers.

Many parents of twins worry about developmental delays in twins. As a parent, I always want to know if my kids are on track.

Why? Perhaps it is because I am an engineer at heart and want to measure everything.

Whether you are an engineer or not, you’ll likely worry about your twins’ development and if they are “normal.”

Common Developmental Delays in Twins

Do twins have developmental delays? Always? It depends…

You will notice that your twins are different from the very beginning. Even in utero they are different sizes and show different behaviors, and this continues after they’re born. Your twins are going to be different sizes, different shapes, and have very different individual needs.

(RELATED: Love podcasts? Check out the entire Dad's Guide to Twins Podcast archive for additional twin tips and interviews with twin dads.)

I’ve even heard from some twin parents that say “one of my twins is developing slower than the other”. Yes, that can happen too. Let’s find out why.

Early Birth Means Complications

Since twins tend to be born early, it is common for them to have developmental delays since they just didn’t have enough time to fully develop in the womb.

Depending on when your twins were born, their development will vary. For example, if your twins are born prematurely as compared to the average 36 to 38 weeks of the twin pregnancy, they may have more complications.

There are several common developmental delays in twins. These include physical development, speech, social, and cognitive abilities.

Don’t worry too much about the twins’ developmental delays. They will work themselves out over time. But if you are going past what you feel are standard milestone dates and your twins are not progressing, you should definitely talk with your doctor.

Here we’ll discuss common developmental delays in twins and your options for dealing with them:

(RELATED: Still looking for the right twin gear? See my Twin Baby Gear Essentials.)


Your twins’ ability to speak and understand your language is key to their developmental growth.

Do twins develop language more slowly? According to research, speech delay in twins is more likely to happen than to their peers. However, they do tend to catch up by age four.

Stranger Twins Shirt

Speech development is something that you can foster in the home. Work individually with twins on their skills, read to them daily and encourage them to try new words and sounds.


Physical abilities can be grouped into two classes: gross motor skills and fine motor skills. Your twins may demonstrate delays in either of these areas.

(RELATED: Still looking for the right twin gear? See my Twin Baby Gear Essentials.)

Gross motor skills involve large movements of your body like walking, crawling, rolling over, etc. Since your twins may be behind here, it is important to help and encourage them to move and exercise their muscles to help develop their gross motor skills.

Fine motor skills are those used for small, more precise movements. This includes things like picking up small objects, turning the pages of a book, and other hand-eye coordination tasks.

4 Critical Mistakes Expectant Twin Parents Make

Do twins develop slower? Not necessarily although your twins may have their own types of physical delays.

Intellectual Development

Intellectual development involves the mental processes that help your twins solve problems. This could be learning to explore the world around them as infants. As they grow it becomes the ability to learn cause and effect, or solving a puzzle.

Different Milestone Timing

Your twins are going to reach milestones at different times as they continue to grow. These differences are natural and should be expected. You may very well have one twin developmentally delayed while the other is progressing at a faster pace.

Your twins will start talking at different times, walking at different times, crawling at different times, sleeping through the night, growing teeth, losing teeth, etc. All of these twin development milestones are going to come at different times. You’ll surely see one twin developing faster than the other. This is totally normal.

Raising Twins Book


If you see or are worried about any of these delays in your twins, talk with their pediatrician. Since twins are typically born early, you may hear about them having an “adjusted age” that accounts for their premature delivery. The adjusted age of your twins can help you reset expectations on when certain milestones should be hit.

Early intervention services can also help your young twins (18 months – 3 years) overcome the delays they are experiencing. These services are available in most locations to children who have been diagnosed with a delay or disability.

Here’s a great overview of early intervention and what it could offer for your family.

Occupational therapy is another option for helping your twins develop their cognitive, physical, sensory, and motor skills. While kids don’t have an occupation in the traditional sense, they are typically playing and being active as children. Occupational therapy for kids can help them fully participate in the activities of childhood.

Raising Twins Book

Parental Mindset

No matter which common developmental delays in twins you experience, be patient with your children. Most twins’ delayed development can be overcome with time and effort. Work with them. Encourage them. Support them through their growth and struggles. Love them.

Your twins will each come with their own set of trials. Your job as a parent is to help guide and direct them through those.

If you’ve had developmental delays in your twins, let us know in the comments section below so we can all learn from your experience.

Your twins may experience one of several common developmental delays. Here's what those delays could be and how you can address them as parents.

Original picture by Donnie Ray Jones

Jurassic Park Style Twins Shirt

Further Reading

Dad's Guide to Raising Twins book
Don't forget to pick up a copy of the definitive guide to raising twins. "Dad's Guide to Raising Twins" was written for fathers of twins to help guide you through the first several years with twins. Click here to learn more about the book and get your copy.

54 thoughts on “Common Developmental Delays in Twins”

  1. Our twin boys are experiencing speech delays. They are now 22 months old and neither of them are really saying any words yet. They do a fair amount of babbling and can make specific sounds (i.e. ya, ma, ba) on cue but do not refer to us as mama or dada yet or name any other familiar items. They understand a lot but simply do not vocalize yet.

    • @Jason – we introduced baby signs with our kids to help bridge that gap of time from when they could understand and when they could verbally communicate with us. Check out Baby Signs by Linda Acredolo and Susan Goodwyn.

      • Hi Joe I would like your opinion my 2 boys ( 2 and a half )do not sleep well at night they make it only to 3,4.30or 5 rare 6 am noticed they required to be outside for 5 hours and get lots of sun could this be a vitamin d deficiency …. we have tried lavender ,hot bath they seem very hungry one of them has sensory issues so he is very picky with food they eat lots of citric limes, oranges , even the skin doesn’t bother him m nuts,etc

      • So I am very exhausted barely have energy to take them out having not been sleeping for 2 years I even tried melatonin doesn’t work with them

        • Try a natural Path clinic. Someone who does blood work.please check for parasites. Apparently everyone has parasites and most people don’t even know it and they don’t get any symptoms. Parasites can cause yeast infections and fungal infections. I’ve heard from some of these clinics that children come in with issues like these. Our twins were going through the same issues. After tests and treatments twins are growing and developing better and are now walking and talking.

    • I have identical boys their are 2 and a half they don’t talk yet only say couple words in 2 languages but they understand Spanish and English. When given instructions
      The doctors just scare and make us think is something else they do make lots of eye contact and smile wait until they catch up they were doing occupantherapy but due to the pandemic we stopped very risky they rather go to the zoo or beach a lot and interact with animals ( we are doing social distancing ) no playing with other kids

      • Doctors were scaring us They were doing the exact same things with our twins. They kept trying to say it’s something else but everything they said turned out wrong. The twins talk, walk and growing normal. Stay strong and don’t give up. Try a naturopath clinic. Ask for blood analysis and poop tests.

    • My two year old twins do not say mommy yet or respond to their names. I was just curious if you had a similar experience and how they are doing now?

      • My twins boys are three and I’ve yet to hear mommy. They are just starting to have a few clear words and signs…and slowly but surely we are getting there…I have hard days and great days.. they will get there and you are doing a great job mommy.

        • My twins are 29months they are delayed in walking on there own. They recently started responding to there names or come here ect… they know A-Z, 1-10 and all the colors and some shapes. They started saying more and more words. They say daddy but NEVER mom or mommy. I hope they start walking on there own soon. I’m concerned with them walking. Do your twins walk??

      • Twins grow differently then singleton child. They are sometimes delayed. My twins are 29months and finally saying more words and responding ect…they know 1-10 A-Z all colors ect…..I used to think something is wrong but I see there just growing slowly.

  2. Our 21 month old twin boys have had some minor delays. They were 6 weeks early.
    In Iowa, the State Government provides a service called Early Access – it’s a program that tracks Preemies up to 3 years of age, if the parents want it. It’s completely free to the family. We love this service. We’ve had the same case worker since the beginning, and our boys love her. Whenever we’ve had issues with development, they give us ideas and resources.
    Fine Motor Skills – they both kept their hands in fists for a long time. We used the plastic links to get them used to opening and closing their hands. Also, they wouldn’t use their thumbs. Our Access case worker brought in an Occupational Therapist to work with us and them. When they didn’t progress, we put the boys in Neoprene Splints to force their thumbs to be straight and not tucked into their hands.
    Gross Motor Skills – Twin A had very low muscle tone. He was laid-back to the point of needing assistance. Twin B had a very high muscle tone, so he was constantly trying to do things before he was ready. We worked with both, and now have 2 running, jumping, and flying boys.
    Speech – Right now we are focusing on Speech. Both boys babble to each other and mimic songs, but not with actual words. They both say “Hi Daddy!” to everyone. Other words heard are: Go, Bye, Kris. They made sounds that sound like sentence syntax, but little to no words. There are no “M”s in their vocabulary. The “oooo” and “eow” for Cows and Cats. So, with the Access Speech Therapist now involved, we’re working on surprise words, repetition, and convincing their 7 yr old brother to not talk for them.

    Sorry for the novel….

    • Oh! and they understand almost everything. Names, places, directions, questions… they’re almost as frustrated as we are that we can’t understand them.

    • @Erin – Thanks for sharing what’s happening with your twins. I’m glad to hear they are making progress and for the help you’ve gotten there in Iowa. As I mentioned for Jason, check out the “Baby Signs” book for some tips on communicating with them.

    • Very well written comment…. and resembles my 19 month old twin boys too. Twin 1 was heavier at birth but has gross motor and speech delays whilst twin 2… climbs everything and is almost walking but only has few words which he doesn’t say in the proper context although he is starting to react when told what / what not to do.
      I recently discovered that they both display a HUGE difference in behaviour when the TV is turned off (even TV on silent draws their attention) so in last month or so I kill power to TV and crawl around forvaboutv1-2 hrs each evening – Twin 1 – has come along more in 1 month than he did in previous 3+ months.

  3. Our son is 25mo and has been in speech therapy for 6 months, it’s helping but he’s just not as verbal as his sister who is talking sentences. We did hand signals and that does help overall. I suspect he will be fine in a year or two. But still glad we’re in speech therapy.

    • Oh i forgot to mention my daughter is great verbally, but still struggles opening a door, which my son has been able to do for a year? So they bothink have strengths and weaknesses.

      • @Dave – thanks for sharing the experience with your twins and the reminder that each child is different and may struggle with his or her own challenges.

  4. I have twin boys and they are now 32 months old. One boy has caught up and on track with most milestones while the other is just starting to repeat some words we say. He doesn’t respond to his name very often and doesn’t identify objects yet. He doesn’t call me daddy or my wife mommy. Worried he may be to far being. He has theropy 3 days a week to help get back on pace but progress is very slow. Any ideas to help speed up the learning curve?

    • @Ty – try practicing little things with your son to reinforce the proper way to speak and respond. Be patient. Talk to the therapist so you’re on the same page of what skills you should be doing at home to practice what was done in therapy.

  5. My twins girls are 10 months old. Bianca and Vera. Vera makes extraordinary eye contact and responds to her name. However, Bianca doesn’t look at us as much nor respond to her amen. We brought this to our pediatrician and she said they’re way to young to even attempt to diagnose them with autism. They’ also are showing no signs of autism to her at all. My question is, has anyone ever experience d this? Thank you for your time. I appreciate the post.

    • Our twin boy is 2yr 10 months, he had the same issue, he was not responding to his name nor making eye contact, this was two months ago when he was 2yrs 8 months, he is getting diagnosed with autism ABA therapy and today he makes eye contact and responds to his name, though he understands only few words and says only dad and mom

      Look out for below symptoms of autism
      Hand flapping
      Mood swings
      Does not point or look if you point at an object
      Repeatative behavior, doing things again and again

    • Yes, I do have 2 year old twins one was born very small both 4 lbs they don’t sleep through the night wake up not even at 6 so it is very exhausting to the point of affecting my health now covid has been very hard on us we just hired someone to help us again you need help with twins this is not a 2 people job unless your spouse is not working and your twins are right on track with their milestones twins with developmental delays required more help

  6. My twin boys are two years old. They weren’t premature but one is not talking yet and his brother says new words every day. He babbles but no words. We had his hearing tested and he can hear fine. He is in an early intervention program and gets speech therapy every week. We were afraid he may be autistic, but they say he isn’t showing signs of autism. He has come a long way, thanks to speech therapy. You can tell he is on the verge of saying Daddy or Mama, but still not there yet. Hopefully he’ll be speaking within the next year.

  7. My girls are 14 months and have yet to say a word. I lucked up on this website, so I feel a little better that it’s more common than I thought. We will still let the doctor know so that we can track it. Also does anyone have a unusually clumsy twin? One twin is great on her feet but the other trips and bumps into everything. She walked into door frames when the door is wide open. She gets a new bruise every month.

  8. My twins were 32 weeks premature. Their birth age is 2 years old. They have severe development delays. We started OT for them when they were one , although considerable change is there but we still have to work on their speech and behaviour. Both at the moment are babbling and attempting to say a few words. Hopefully further treatment helps

    • Hi Pooja I have the same case ,my 31.4 weeker just turned 2 actual 22 months adjusted ..boys —identical twins …they have recently started making good eye contact which was lacking previously ..both babbles no meaningful words but they just after their birthday started repeating words but don’t think they understand …we are very worried about their speech language delay

  9. Hi my twin boys are 23 months and both don’t speak , one twin is saying a few words while the other has said the word “bad” a few times but hasn’t said much since. My biggest worry is one twin not responding to his name and the hand flapping , although he will make eye contact play with other children and sing songs not the words but babble along with the tune. I’ve read up on sensory issues which seems to be what he has, when he gets overly excited seems like he wants to bite or squeeze to release his tension. I’m not sure how to explain it but I’ve read that’s called a sensory issue, he does these movements more then the hand flapping abt one else with these issues please help?!

    • @Michelle – you should talk to your sons’ doctor about this and possible intervention services. Your doctor can verify what the actual issue is and help you get therapy or other resources to help your boys with their speech.

  10. Hi, I live from the Philippines, my twin boys are 21 months old now , I’m worried as they don’t respond to their names when being called, and still does not know how to point objects. However, they babble and sing along with the nursery rhymes, they have also memorized the alphabets.Glad that I was able to read your stories which makes me realize I’ m not alone experiencing such. I hope there will be progress for my twins.

    • @Sha – Hang in there and keep practicing and reading with your twins. You can always talk to your doctor about their progress as well.

  11. Hello to all the parents there who are doing their best raising twins:

    I have 22 months old twins, a son and a daughter. My son doesn’t respond to his name quite often compared to my daughter. Both are non verbal. My daughter babbles a lot. But my son does a little.
    Earlier they used to watch tv a lot, specially my son. After cutting off tv completely, I could see, my son is having good eye contact, likes to cuddle. Still not responding to his name quite often.
    Since last month, he started banging his head on the floor. My nephew and daughter snatched his toys 7-8 times continuously and started shouting at him. In a day or two, he started banging his head.
    Now, when he sees his sister or any kid in daycare, he gets aggressive.
    We took him for Autism diagnosis, but doctor said he is too young for diagnosis. Also , he said, if we hadn’t mentioned about autism, he would have considered him as a normal kid.
    Don’t know what to do. He suggested us for early intervention.

  12. Hi i have fraternal twins and they don’t weigh the same weight the other twin weighs 7.5 and the other weighs 4.1 they recently turned 6 months and while I was pregnant I didn’t know that I was having twin till the day of delivery, so I am worried about the other twin that weighs 4.1 even the nurse at the clinic said I must go see a dietician

    • It is normal for twins to be different sizes but you’d be wise to talk to your doctor about if your children are fine as-is or need some extra help.

  13. I’m a mom of 16 month (14 adjusted) identical twin girls. We are in early intervention services and have an eval set up for speech therapy in Jan. One of my girls will not speak or even attempt to learn a new word. Seems like when she does learn something new she regresses within a few days. Both of my kids don’t respond to their name, don’t point, don’t follow my finger when I point, don’t seem engaged when I interact with them, hand flapping, etc. Scout, the twin I feel is regressing, has an MRI scheduled. I’m nervous but hoping to find something out. I have a deep feeling that she is on the spectrum. Maybe we’ll get a diagnoses soon.

    • Heather, Thank you for sharing what is happening with your twins. I hope that your upcoming appointments help shine light on why things are this way and what you can do as a parent to support your girls.

  14. My twins grand babies are identical and 4 years old. Twin a has developed well and twin b is slowly developing she doesn’t speak much she makes noises all the time. And holds her hands up side ways.

  15. I have identical twin boy great-grandsons; they are 3.5 months and were 1 month early (aga 2.5 months). My grandaughter is concerned because although the boys have lifted their heads for about 1 month during tummy time, their neck is still floppy when you hold them. Ant thoughts?

  16. Our twins were 2 months premature, now are 47. Son got therapy through Easter Seals. Daughter worked hard at school and life, friends seems so much easier now. She spoke for him, protected him. He pushed her up to the wall at 14 and said I can speak for myself.

    Son’s ego seems dependent on projects he’ll do for ppl
    Is son still dev delayed at this age, or does he never catch up to normal people his age?

    • @Nancy – typically twins catch up to their peers during childhood unless there are underlying issues. Your question might be better answered by a medical professional.

  17. Really they catch up during childhood?
    I know people pleasing is a huge wall for him . Seems driven by that.
    Our daughter, his twin , has no problem with meeting goals, esp excelling at work, leading with her heart because she sees a need or just wants to , having many friends.
    Can you name just a few underlying issues that come to mind?
    Thank you.


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