A Two Year Old Toddler Is Half His Adult Height

Of all the things I heard when it came to children this has go to be one of the coolest. Around the time a toddler turns two years old he/she has already reached half the height they will be when they are adults.

When we first heard this from my sister in-law (the pediatric dentist), we thought she was crazy. We said maybe more like three times the height but definitely not twice the height. That’s what we thought until we tested it on our niece who was almost three at the time. It turned out that when we doubled her height she was almost six and half feet tall!

Well my son just turned two in mid November and we decided to test the theory. Here is a photo of us measuring our sons height in mid-November.


As you could see he is 34″ tall. If you double that height you get to 68″ which translates to 5 feet 8 inches tall. Our pediatrician told us recently that while the theory is true the height isn’t exactly when the child is 24 months old. The child might reach half their adult height when they are either 23 months old or 25 months. Either way, this is pretty cool.

Now here is a picture of how tall he will be when he is an adult. I’m 5′ 11″ so it seems he will be a bit shorter. I just hope that he will still be as cute.


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16 Responses

  1. JHS says:

    Thanks for contributing this post to this week’s Carnival of Family Life, hosted at A Child Chosen. The Carnival will be live on Monday, February 5, 2008, so I hope you and your readers will stop by and check out all of the fabulous entries included this week!

  2. Christy Haley says:

    This is true! When my daughter was 2, I measured her. This number stated she would be 5’9″…at 17 years old, she is 5′ 71/2″, with time to grow. Cool, huh?

  3. Amanda says:

    Does anyone know if this holds true with preemies as well? Just wondering.

  4. Robyn says:

    My son was 40″ at 24 months, so we thought he may be 6’8″! (I’m 5’8″, his dad is 6’2″, with 3 brothers over 6’5″.) Then when he was 11, the pediatrician said he’d be about 6’2″. He’s not quite 13, and he’s just under 5’8″, wearing a 13 shoe. He’s grown about 4″ (and 2 shoe sizes) in the last 5-6 months. I really don’t know what to believe!

  5. jack says:

    im tall

  6. Jun Rama says:

    This is true. My son was 3 feet 1.5 inches on his 24th month, he is 21 years old now and 6’3.

  7. Charlotte says:

    My daughter was 32″ at 2 years, so in theory she’ll be 64″/163cm when she’s grown. I’m 160cm and my husband is 180cm so this sounds about right.

  8. Doug says:

    My parents measured me at 2 and thought I would be 5’9. I grew to 6’3″. Go figure. My son was only 34 inches at two. My wife is only 5’9 but has a dad and brother who are 6’6! What do you think will happen?

  9. Jennifer says:

    Thank you for this great post. My son is almost 16 months old. We will definitely measure him (and take a photo like you did) on his 2nd birthday!

  10. Aaron says:

    I was 34″ at 2 years old. I grew to be 6’2″, so the rule definitely isn’t precise. I think whether or not the baby is born early or late matters too. My son is 21 months old, and he’s already 36″, so it will be interesting to see if he hits a growth spurt before he turns two. Also, the growth cycle of men is different than women. most women reach their full grown height by the age of 13-14. Most men reach there full grown height by 18-20

  11. Matt says:

    Ä°t’s not true. Ä°t’s a very vague approximation. Ä° and one of my brothers are 2-3″ taller than predicted, whilst the youngest brother is 6″ shorter. Ä°t is interesting but merely a very rough guide

  12. Sally says:

    I think this only applies to boys as girls have a growth spurt earlier than boys. I was told that a boy is half his adult height at 30 months. At that age my son was 3ft 3 inches he is now 28years I’d and is 6ft 6″

  13. Hey guys, I am a new parent and I’m trying to get my two month baby to sleep longer during night. Right now I’m fortunate to get three hours rest per night. Best wishes

  14. What is happening here?

    Is it something to do with the pineal or pituitary gland?

  1. April 10, 2008

    […] with the pediatrician last week. Charlie is still a big boy! If it’s true what they say about kids reaching half their adult height around the age of two, then he’ll be about six feet […]

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