My wife was in the hospital for 10 days after the birth of our son, and so he was fed with a bottle during that time. Once my wife came back home, we started to breastfeed, but have now got a strange cycle where often he'll feed for 5-10 minutes, fall asleep (can't wake him up), have his diaper changed (my attempt at the Activity), but then will start crying again rather than sleeping, and will need to be fed again. Even after the 2nd feed he will fall asleep but then will often wake up a short while later (5-10 mins) and be very fussy. It's difficult for him to get a full 2-3 hours of sleep. My wife feels that maybe he's not getting a lot of milk in him, that maybe he can't suck very well. When I was feeding him those first few days, he was on a regular routine with 2-4 hours between feeds, and sleeping well. Now he seems to be snacking all the time, and his sleep is often short.
He is only 3 and a half weeks old. Any advice? I live in Japan so it's tricky getting information that I can fully understand, and my wife has been reassured by a nurse to just feed him whenever he seems hungry. But this pattern seems wrong.