There’s usually one runt kitten born in a litter and they are easy to distinguish since they’re the smallest and the weakest of the group.Runt kittens might have congenital defects, which are abnormalities of structure, function, or metabolism.
Noticing that your kitty is small could be a sign of an underweight cat. That’s why having a feeding schedule is important because it will ensure that your feline companion is eating the necessary daily food portions for maintaining a healthy weight.
Another reason your cat might be small are parasites they had earlier in their life or still carry as kittens. The common types of worms that can affect cats are hookworms, tapeworms, and roundworms.
If your cat has been eating regularly and you don’t notice any loss of appetite, but instead there’s a loss of weight then they might have Diabetes or hyperthyroidism.