weight loss 600gm in just 12 days baby boy.urine 7 time /day and stoll pass 3 times every day. what is the problem

A. Up to 500 g is common to be seen as weight loss with lot of kids because of jaundice if your child has lost 600 g it’s okay but if the child starts to pick up on the way now a minimum of 500 g in a month then it would be considered Idea healthy otherwise you can start with formula