BottleBabyKitten age & weight chart
Week-by-week weight ranges in grams for kittens from birth to eight weeks, with the milestones and feeding schedule that go with each stage. Daily weight is the single best early warning sign you have with a bottle baby.
The quick rule
Kittens gain roughly 10–15 grams a day, about 100 grams a week, and reach 1 pound per month of age. A kitten's weight in grams divided by 100 is a rough age in weeks.
Weight by age
| Age | Weight (g) | Weight (oz / lb) | Feeding | Milestones |
|---|---|---|---|---|
| Newborn (0–1 week) | 90–150 g | 3–5 oz | Every 2 hours, around the clock | Eyes and ears closed, umbilical stump present, cannot regulate body temperature. |
| 1 week | 150–250 g | 5–9 oz | Every 2–3 hours | Eyes begin to open, ears start to unfold, still crawling rather than walking. |
| 2 weeks | 250–350 g | 9–12 oz | Every 3 hours | Eyes fully open (blue), ears upright, first wobbly steps, deworming usually starts. |
| 3 weeks | 350–450 g | 12–16 oz | Every 4 hours | Walking, baby teeth coming in, first attempts at the litter box. |
| 4 weeks | 450–550 g | 1–1.2 lb | Every 4–5 hours + gruel | Playing, grooming, using the litter box reliably; weaning can begin. |
| 5 weeks | 550–650 g | 1.2–1.4 lb | 4–5 meals a day | Eating wet food mixed with formula, pouncing and running. |
| 6 weeks | 650–750 g | 1.4–1.7 lb | 4 meals a day | Mostly weaned, eye colour starting to change, first FVRCP vaccine. |
| 7 weeks | 750–850 g | 1.7–1.9 lb | 3–4 meals a day | Fully weaned onto kitten food, confident and very playful. |
| 8 weeks | 850–1000 g | 1.9–2.2 lb | 3 meals a day | Reaches the 2 lb mark — the usual threshold for spay/neuter and adoption. |
Ranges reflect commonly published neonatal kitten care benchmarks and are written for BottleBaby; no chart from another organization is reproduced. Healthy kittens vary — the trend over days matters more than any single number. This page is general information, not veterinary advice; ask your vet or rescue about your kittens.
When to worry
- No gain for 24 hours — recheck the scale, the latch and the formula, and increase feeding frequency.
- Any weight loss — treat as urgent and call a vet or your rescue's medical lead.
- Cold to the touch — never feed a cold kitten; warm slowly first.
- Under 90 g at birth — a "peanut" needs round-the-clock monitoring and more frequent weighing.
Common questions
How much weight should a kitten gain per day?
A healthy neonatal kitten gains roughly 10–15 grams a day, or about 100 grams (a little under 4 oz) per week. No gain for 24 hours is a concern; weight loss is an emergency.
How much should a newborn kitten weigh?
Most newborn kittens weigh between 90 and 150 grams (3–5 oz) at birth. Anything under about 90 grams is considered underweight and needs close monitoring.
How can I tell a kitten's age by weight?
As a rule of thumb kittens gain about 100 grams per week, so a kitten's weight in grams divided by 100 gives a rough age in weeks. Confirm with milestones such as eyes opening (about 1 week), walking (about 3 weeks) and teeth (about 3–4 weeks).
When should I weigh a bottle-fed kitten?
Weigh at the same time every day, ideally before the first morning feeding, using a digital kitchen scale that reads in grams.
How much should they eat?
Formula amounts follow body weight — see the kitten feeding chart by age for mL per feeding, feedings per day and daily totals.
Track it instead of guessing
BottleBaby keeps one log per kitten: every feeding, every weight check with the gain since last time, daily notes and upcoming vet visits.
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