I dont think he is hungry. he seems content after each feed. Also even if he wakes from his nap, he just plays and does not cry. he has been on a 3hr schedule for maybe past 20 days or so. Sometimes he gives hunger cues by 2 1/2 hrs and if I offer, he feeds. In the past Ive tried to offer to feed thinking that he is hungry but he refuses to feed. He feeds only if he is hungry. Also his weight gains seems okay. So I dont think its low supply. (Initially i thought it was the same problem too..). I think I just have to accept that he is a short napper.
PS: Thank God, his night wakings have reduced. He has started to sleep again in the night though he feeds every 3hrs. :-) One big relief for me.