18 months baby average weight & height reference table
According to the WHO Child Growth Standards, the average (median) weight at this stage is about 10.9kg for boys and 10.2kg for girls, and the average height is about 82.3cm for boys and 80.7cm for girls.
| Item | Guideline (reference) |
|---|---|
| Average weight (boys) | ~10.9kg |
| Average weight (girls) | ~10.2kg |
| Average height (boys) | ~82.3cm |
| Average height (girls) | ~80.7cm |
How growth usually goes at 18 months old
These numbers are only the average (50th percentile); the normal range is much wider. Even if your baby differs from the average, as long as their own growth curve keeps rising steadily, there's usually nothing to worry about.
What to keep an eye on
The trend of the growth curve matters more than a single measurement. If the curve suddenly drops or flattens, bring it up at a checkup.
aldagado's tips
- Check the growth curve at regular well-baby checkups.
- Rather than comparing with other children, follow your own baby's curve.
FAQ
My 18 months baby is different from these guidelines — is that okay?
These numbers are just average references, and the normal range is much wider. Babies vary a lot, so look at the steady trend rather than a single point in time. If you're worried, talk with a professional.
The information on this page is general reference material based on widely used parenting standards (such as the WHO Child Growth Standards) and does not replace medical diagnosis or treatment. Babies vary greatly in how they grow and develop, so if anything concerns you, please consult a pediatric professional.
18 months baby — explore other topics too
Your baby's guideline is made by your baby
Averages are just a reference; your real guideline is your own baby's records. With aldagado, just speak a few words and feeding, sleep, and growth build into your baby's very own patterns.