11-Month-Old Baby Weight & Length Chart
Just one month from their first birthday! At 11 months, babies understand far more words than they can say and are testing limits as they discover independence.
Boy — 50th %ile
Girl — 50th %ile
⚖️ Weight by Percentile
| Percentile | 👦 Boy | 👧 Girl |
|---|---|---|
| 5th Percentile | 17 lbs 7 oz | 16 lbs 1 oz |
| 10th Percentile | 18 lbs 1 oz | 16 lbs 12 oz |
| 25th Percentile | 19 lbs 3 oz | 17 lbs 14 oz |
| 50th Percentile (median) | 20 lbs 12 oz | 19 lbs 3 oz |
| 75th Percentile | 22 lbs 4 oz | 20 lbs 8 oz |
| 90th Percentile | 23 lbs 6 oz | 21 lbs 10 oz |
| 95th Percentile | 24 lbs 4 oz | 22 lbs 8 oz |
📏 Length/Height by Percentile
| Percentile | 👦 Boy | 👧 Girl |
|---|---|---|
| 5th Percentile | 2' 4.3" | 2' 3.7" |
| 10th Percentile | 2' 4.6" | 2' 3.9" |
| 25th Percentile | 2' 4.9" | 2' 4.3" |
| 50th Percentile (median) | 2' 5.3" | 2' 4.7" |
| 75th Percentile | 2' 5.7" | 2' 5" |
| 90th Percentile | 2' 6.1" | 2' 5.4" |
| 95th Percentile | 2' 6.4" | 2' 5.6" |
📊 What Does My Baby's Percentile Mean?
A baby at the 50th percentile weighs more than 50% of babies the same age. The 25th–75th percentile range is considered average. Any percentile from the 5th to the 95th is medically normal — your baby's growth curve matters more than their rank. A consistently healthy 10th-percentile baby is thriving; a baby who drops from the 70th to the 30th percentile warrants a conversation with your pediatrician.
🌟 Developmental Milestones
- Walks holding onto furniture confidently
- Says 2–3 words with meaning
- Follows simple one-step directions
- Stacks 2 blocks
Separation anxiety peaks around 9–18 months. A consistent goodbye ritual (brief hug, wave, and saying you'll be back) helps more than lingering or sneaking away.
🍼 Feeding at 11 Month Old
Continue breast milk or formula (16–24 oz/day). Three meals plus 2 snacks. Begin introducing whole milk in small amounts to prepare for the 12-month transition.
🚨 Talk to Your Pediatrician If…
- Not standing with support
- No words at all
- Doesn't search for hidden objects
- Marked regression in skills
Frequently Asked Questions
How much should an 11-month-old weigh?
WHO median is 9.4 kg (20.7 lbs) for boys and 8.7 kg (19.2 lbs) for girls. Healthy range: roughly 7.9–11.0 kg (17.4–24.3 lbs).
How many words should an 11-month-old say?
Most 11-month-olds say 2–5 meaningful words, but understanding (receptive language) is far ahead of speaking. Some babies say few words at 11 months and then have a language explosion after 12–18 months.
When can my baby switch to cow's milk?
The AAP recommends transitioning to whole cow's milk at 12 months. Some parents introduce small amounts at 11 months to ease the transition.
Is it too late if my baby isn't walking at 11 months?
Not at all. The normal range for first independent steps is 9–15 months, with many perfectly healthy babies walking after their first birthday.