You can generally soak kittens in cat food until they are 2 to 3 months old. The specific time depends on whether the kitten’s teeth have grown straight. If the kitten’s teeth grow slowly and do not grow straight, then you need to eat wet food; If the kitten's teeth have grown straight, you can switch to dry food. Just soak the cat food for about two minutes each time. Do not put too much water to avoid the loss of nutrients in the cat food; and do not feed the cat food too full each time to avoid indigestion in the kitten.