Chubby kids are healthy??

I don't know of this is good or wrong but many parents find that chubby kids are healthy. I have a chubby boy too, he is choosy in eating even though he looks like big boy. I was told that some milk powder gives kids chubby because of the fat contained.

This reminds me of doctor says that pregnancy milk powder also contains lot of sugar. He suggests to drink low fat milk not full cream milk.