Cluster feeding - overfeeding?

Do babies over feed when theyre cluster feeding?

12 week pp, dont remember baby spitting much during last cluster feedings, but yesterday i noticed baby wanting to nurse but then he kept spitting milk (not curdled so it wasnt digested milk), i guess baby was overfeeding but idk how since I've read that breastfed babies cannot be overfed.

Also baby has been extremely fussy and crying like he is in pain and stops crying when held or nursed. Only naps for 30 mins then wakes up crying bloody murder.