By all means it could be a normal phenomenon. but excessive sweating on the baby while feeding is a sign off any heart disease ,which may not be there in your baby's case but still you have to watch for his weight gain, any breathing problem like rapid breathing and also observe whether the baby is able to take feed continuously or is stopping after a few sips and again taking the feed . so better you get checked up by a pediatrician to rule out any such cardiac problem

It's absolutely normal...

Hi, Baby’s sweating is normal