Hello moms, I'm 9 days pp, my son sleeps really well during the day and falls asleep quickly after…

Hello moms, I'm 9 days pp, my son sleeps really well during the day and falls asleep quickly after feedings but at night, usually 12-6am he's really fussy and doesn't sleep well after feedings and wants to eat more during that time. Last night he cried every 1-2 hrs, so we changed diapers and held him, shushed him, patted him, fed him until he finally fell asleep around 5 am. Any other moms experience this? Wat can be done to help him (and us) sleep and relax better during those early mornings?