Check teeth:
No teeth yet: usually under 1–2 weeks
Small incisors: about 2–3 weeks
Canines start forming: about 3–4 weeks
Premolars/molar eruption begins: about 4–6 weeks
Most baby teeth present: about 6–8 weeks
Check eye opening:
Eyes closed: newborn to ~7–10 days
Eyes start opening: ~7–14 days
Eyes fully open and clearer vision: ~2–3 weeks
Check ear development:
Ears folded/closed: newborn to ~1 week
Ears begin standing: ~2–3 weeks
Check walking and coordination:
Crawling/unsteady: ~1–2 weeks
Starting to walk: ~2–3 weeks
Walking confidently: ~3–4 weeks
Check ability to eat:
Nursing only: ~0–4 weeks
Interested in food, starting weaning: ~3–5 weeks
Eating solid food reliably: ~5–7 weeks
Check litter box use:
Not reliable yet: ~0–3 weeks
Gradually learns: ~3–5 weeks
More consistent: ~4–7 weeks
Check fur development:
Sparse/soft fuzz: newborn to ~2 weeks
Noticeable fur coverage: ~2–4 weeks
Mostly full kitten coat: ~4–8 weeks
Check size and weight (approximate ranges):
~1 week: ~4–8 oz (100–225 g)
~2 weeks: ~8–12 oz (225–340 g)
~3 weeks: ~12–16 oz (340–450 g)
~4 weeks: ~1–2 lb (450–900 g)
~5–6 weeks: ~1.5–3 lb (700–1,400 g)
Check behavior:
Mostly sleep and nurse: ~0–3 weeks
More play/mobility: ~3–6 weeks
Confident play and social behavior: ~6–10 weeks
Use “best estimate” ranges:
If multiple signs conflict, choose the age range that matches teeth + eye opening + ability to walk/eat
Get help from a veterinarian or rescue if:
The kitten is very young, very underweight, or you’re unsure about health, dehydration, or infection