10 week old sleeps all night??

Ariel • #AlmostNurse PreemieMommy 💙 Baby #2 #Jan2020

I have a 10 week old son. He was born 5 weeks early 4lbs 14oz. Now he's 9lbs 8oz and measuring with kids that was both around my due date. For the past few weeks he's been eating less at night and sleeps for 3-4 hrs each nap and he'll stay woke for 2-3hrs in between but last night he slept from 7pm-3:30am he woke up and ate half a bottle and went back to sleep at 4. He woke up at 6:30 I changed his diaper and he went back to sleep? Is this normal?