Gerber Baby Size Chart — Fit by Weight & Height
The Gerber baby-clothing size chart, size by size — the weight and height each label covers, and how Gerber compares with the Size Index median for each size (taken across the distinct brand charts that print a weight for it). Based on the brand’s own published chart (retrieved 2026-09-02); we compare published charts and do not handle or test any garment.
Gerber published sizes sit about 0.5 lb above the Size Index median on average across 11 sizes (0.45 lb before rounding; we call a chart close to average when its sizes average less than 0.5 lb from the median) — close to a typical chart, so buy your baby’s usual size.
Gerber baby size chart (weight & height)
| Size | Fits weight | Height | Size Index median | Gerber vs median |
|---|---|---|---|---|
| Preemie | up to 5 lb | up to 17 in | 5.5 lb | −0.5 lb |
| Newborn (NB) | 5–8 lb | 17–21 in | 8 lb | 0 |
| 0-3M | 8–12 lb | 21–24 in | 12 lb | 0 |
| 0-6M | up to 16 lb | 17–26 in | — | — |
| 3-6M | 12–16 lb | 24–26 in | 17 lb | −1 lb |
| 6-9M | 16–20 lb | 26–28 in | 20 lb | 0 |
| 12M | 20–24 lb | 28–30 in | 23.5 lb | +0.5 lb |
| 18M | 24–28 lb | 30–32 in | 27 lb | +1 lb |
| 24M / 2T | 28–32 lb | 32–34 in | 30 lb | +2 lb |
| 3T | 32–35 lb | 34–38 in | 34 lb | +1 lb |
| 4T | 35–39 lb | 38–40 in | 38 lb | +1 lb |
| 5T | 39–43 lb | 40–44 in | 42 lb | +1 lb |
Read the “vs median” column to see where Gerber differs: a positive number means that size covers heavier babies than the typical brand (runs bigger on paper); negative means smaller. Compared across 11 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 Gerber published size chart and compares each size to the Size Index median for that size, taken across 13 to 27 distinct brand charts depending on the size, from our 30-brand 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.