Milk came in, nursing shorter but more often?

Milk is starting to really come in and my 3 day old went from staying latched sometimes over 25 minutes to only wanting to stay latched on for 5 minutes at a time almost. He seems to be getting plenty of milk but I have been feeding him now in much closer intervals instead of waiting 2-3 hours. Anyone have experience like this or advice? I don't want to do anything that will mess up getting him on a routine long term but I'm more worried about knowing he's getting enough. Thanks!