If he is back at birth weight you don't need to wake him
As long as he’s back at his birth weight or above, don’t wake him xx
I would wake during the day to make sure he's stocking up on calories but like others mentioned if he's at birth weight you're good to let him sleep
As long as he's getting the amount he should eat in a 24 hour period, it's fine
Ask your pediatrician to be sure, but at 1 month it is usually okay to let the baby sleep if healthy and gaining weight. My baby is now 4 months and she will sleep about a 4-5 hour stretch before waking up to feed again. If he wakes up 1-2 times a night then it’s probably okay to let him sleep a longer stretch.