Dr. Supriya
Hi fatima , if the kittens are 3 months old no need to put them on milk replacers. Don't try to feed cow milk because they may be lactose intolerant. If your changing their diet drastically then also there will be loose motions, so please make sure food change is gradual. If your kittens are not deformed properly please get it done asap.Even after all these If the loose motion continues please consult a veterinarian through online or book a home visit