Kittens typically grow eight times their size in just about eight weeks. Under 1 week old: Kittens weigh less than 4 ounces. 7 to 10 days old: Kittens weigh 4 to 6 ounces.
The right time to transition your cat from kitten to adult food starts around 10-12 months of age. However, if your little furball is struggling to keep weight on, it would be advisable to keep your furbaby on kitten food until they are 2 years old or even longer.
Most experts agree that cats reach adulthood at 12 months old, which generally means that this is the age where the cats’ personality has matured and solidified into how they’ll behave throughout their adult lives.
Another factor that contributes to your cats’ growth (or lack thereof) is their breed. The breed of your cat can affect its rate of growth. Unsurprisingly, the larger cat breeds take longer to reach their full potential of growth due to longer time periods to reach maturity.