Drinking lesser milk (baby only 13 days old)

yoohoo, my bb feeds abt 50-60ml before 1 month. i heard as long as bb is producing enough wet diapers and poop and no diarrhea or constipation etc, there's probably nothing to worry about. (unless baby vomits or refuse to drink then you might need to worry if bb is sick) Also monitor his weight. if his weight consistently drops, you might want to consult the PD.