At 4 months of age, a kitten should weigh approximately 5 to 7 pounds. If a kitten weighs too much above the average, pet owners should try to limit its food. Conversely, if a kitten weighs too little, consider feeding it food with a higher fat content or taking it to a veterinarian.
At 4 months of age, a kitten should start to gain its adult teeth, and should be 2 months away from reaching full sexual maturity and growth potential. Because of this, this is an optimal time to get a kitten spayed or neutered. Kittens at this age are also fully socialized and ready to separate from the mother cat or siblings.