How to Determine the Age of a Kitten

At a glance

  • Birth: Newborn kittens weigh between 90 – 100 grams, the umbilical cord is attached, eyes and ears are closed.
  • 0 – 3 days: The umbilical cord falls off on the third day, eyes are still shut.
  • 7 – 10 days: All kittens are born with blue eyes which begin to open from day seven.
  • 2 – 3 weeks: The kitten begins to stand, the eyes and ears open.
  • 4 weeks: The kitten starts playing and exploring her environment.
  • 5 weeks: Kittens are confident on their feet by this age.
  • 6 + weeks: The kittens are extremely active.


Newborn kittens

Baby teeth:

  • 2 weeks: Deciduous incisors (the small teeth at the front) begin to come in.
  • 3 – 4 weeks: Deciduous canines (the long, pointy teeth next to the front teeth) begin to come in.
  • 4 – 6 weeks: Deciduous pre-molars (also known as bicuspids, these are the teeth located between the canine and molar teeth)  begin to come in.
  • 8 weeks: All baby teeth have come in.

Adult teeth:

  • 12 – 16 weeks: Incisors come in.
  • 4 – 6 months: Canines, premolars, and molars come in.
  • 7 months: All adult teeth are fully developed.


One week old kitten
  • 0-2 weeks: Eyes are sealed shut at birth.
  • 2 weeks: Eyes begin to open, eyesight is not developed yet.
  • 5 weeks: Eyesight is fully developed.
  • 6-8 weeks: Eyes start to change colour.


Two-week old kitten
  • 0-3 weeks: Ears are folded, cats are deaf at birth.
  • 3 weeks: Ears prick up, hearing is well developed.


Three-week old kitten
  • Birth: Kittens weigh 90-100 grams.
  • 1 week: Kittens have doubled their weight.
  • 2 weeks: Weight is now 300g.
  • 4 weeks: The kitten should now weigh 500 grams (18 oz).


Four-week old kitten
  • 0-2 weeks: Kittens nurse and sleep.
  • 3 weeks: Some kittens are starting to stand.
  • 4 weeks: Kittens are becoming more active.

Julia Wilson is a cat expert with over 20 years of experience writing about a wide range of cat topics, with a special interest in cat health, welfare and preventative care. Julia lives in Sydney with her family, four cats and two dogs. She enjoys photography, gardening and running in her spare time. Full author bio Contact Julia