babyGap Baby Size Chart — Fit by Weight & Height
The babyGap baby-clothing size chart, size by size — the weight and height each label covers, and how babyGap compares to 30 other brands. Based on the brand’s own published chart (retrieved 2026-09-02); we compare published charts and do not handle or test any garment.
Across its published chart, each babyGap size covers about 1.1 lb more weight than the 30-brand median. If your baby is between two sizes, you can usually stay in the smaller babyGap size a little longer.
babyGap baby size chart (weight & height)
| Size | Fits weight | Height | 30-brand median | babyGap vs median |
|---|---|---|---|---|
| Up to 7 lbs | up to 7 lb | up to 18 in | — | — |
| 0 - 3 mos | 7–12 lb | 18–23 in | 12 lb | 0 |
| 3 - 6 mos | 12–17 lb | 23–27 in | 17 lb | 0 |
| 6 - 12 mos | 17–22 lb | 27–29 in | 22 lb | 0 |
| 12 - 18 mos | 22–27 lb | 29–31 in | 27 lb | 0 |
| 18 - 24 mos | 27–30 lb | 31–33 in | 30 lb | 0 |
| 2 yrs | 30–33 lb | 33–36 in | 31 lb | +2 lb |
| 3 yrs | 33–36 lb | 36–39 in | 34 lb | +2 lb |
| 4 yrs | 36–40 lb | 39–42 in | 38 lb | +2 lb |
| 5 yrs | 40–46 lb | 42–45 in | 42 lb | +4 lb |
Read the “vs median” column to see where babyGap differs: a positive number means that size covers heavier babies than the typical brand (runs bigger on paper); negative means smaller. Compared across 9 matching sizes.
How we built this
There is no US standard for baby-clothing sizes, so the same label fits different weights at different brands. This page reproduces the babyGap published size chart and compares each size to the median of 30 brands from our Baby Clothing Size Index 2026. Figures are from the brand’s published chart (retrieved 2026-09-02); we compare published charts only and never claim to have measured or tested a garment. For clothing fit only — not a guide to how much a baby should weigh.