Who feeds a newborn? We've been at it for two weeks now, daytime sleep…

Who feeds a newborn? We've been at it for two weeks now, daytime sleep is really bad. Nighttime is okay. So, how do you feed? By demand or by the clock? Sometimes I overfeed ? With my son, I fed on demand, but now it seems like we need to feed by schedule. Because sometimes he just sucks and lies down, even though milk comes out anyway ?‍?. It seems like there isn't much difference between children, but I forgot all about it, apparently.