Kittens at 20 days old are usually not yet able to feed themselves. At this age, the kitten's main source of nutrition should be the mother cat's milk or artificial breastfeeding. Kittens' digestive and immune systems are not fully developed at this time, so they are unable to process solid food.

For kittens in the weaning period, they usually start around 4 weeks old Try solid foods, but they won't be fully weaned and start eating independently until they are 6-8 weeks old. During this transition period, kittens may show curiosity about solid food and try to eat simple foods, such as cat food.