My son is 4 days old, he is extremely hard to wake up or keep awake once latched. We stimulate with tickling diaper change(which doesn’t phase him)cold wrap on his back and even tried unlatching to switch breasts. But he just doesn’t want to eat.
Any advice and similar situations?

When I just had colostrum he fed A LOT and would barely sleep. And not my milk is in at full force and he won’t even eat. When I do finally get him latched he barely feeds for 5-10 mins in each or maybe 15 mins in one. Before literally knocking out.