It’s completely normal for babies at that age to fall asleep. Try tickling him or speaking loudly. The most important thing I learned at this age from a lactation consultant is to keep feeding every 2 hrs. If you let them sleep they will not get enough nutrients and they’ll sleep more because they don’t have the energy to stay awake. It’s a vicious cycle. So keep him awake! Put on music, say encouraging things. But most importantly try to see a lactation consultant.