she also don't eat properly no milk and Not even doing poop for 3/4 days I don't know what should I do

A. Teething could be happening with your child that is why your child is probably having loss of appetite also your child is having constipation which is why is the previous dump is not clean the child may not be willing to eat so kindly either give oral laxative or put a suppository in the inner region of the child to clear the system hopefully after that things will be better