poopy diaper

So my baby is 1 month old today (first baby so I don't know what I'm doing 😛) he sleeps pretty good at night but during the day it's hard to get him to nap. When he poops I never know if I should wake him and change it bc I know he won't go back to sleep or just wait til he's up. He usually naps for like 2 hours max but I know I wouldn't want to sit in my own shit lol. Opionions?