1. Size and Weight:
- Newborn kittens are tiny and weigh around 2-4 ounces (56-113 grams).
- They grow quickly and gain weight within the first few weeks.
2. Eyes:
- Newborn kittens are born with their eyes closed.
- Their eyes start to open around 7-10 days of age.
- By 14 days, their eyes should be fully open and blue or grayish in color.
- The eye color may change to the permanent color between 6 weeks to 6 months.
3. Ears:
- Newborn kittens' ears are folded and sealed shut.
- They start to unfold and become erect between 7-14 days of age.
4. Teeth:
- Deciduous (baby) teeth start to appear around 2-4 weeks of age, beginning with the incisors (front teeth).
- By 6-8 weeks, most of the deciduous teeth should be visible.
5. Mobility:
- Newborn kittens are immobile and crawl by dragging themselves.
- Around 3 weeks, they start to wobble on their feet.
- By 4 weeks, they can walk and run clumsily.
6. Weaning:
- Kittens typically start weaning from their mother's milk between 3-4 weeks of age.
- They become fully weaned and able to eat solid food by 8-10 weeks.
7. Litter Box Training:
- Kittens start to show interest in using the litter box around 3-4 weeks of age.
- With proper training, they usually become litter box proficient by 6-8 weeks.
Approximate Age:
- Birth to 1 week: Eyes closed, ears folded, immobile.
- 1-2 weeks: Eyes opening, ears unfolding, crawling.
- 2-3 weeks: Deciduous teeth appearing, wobbly walking, starting to play.
- 3-4 weeks: More active, weaning begins, using the litter box.
- 4-6 weeks: Walking, running, playing vigorously, most deciduous teeth visible.
- 6-8 weeks: Fully weaned, litter box trained, permanent teeth starting to appear.
Remember, these are general guidelines, and individual kittens may vary in their development. If you're unsure of a kitten's age, it's best to consult with a veterinarian or animal shelter for a more accurate assessment.