My new baby is 16 days age now but we can fil like he has pen when he is trying to do toilette is constipation problem for new born we can't sleep?

May be normal: Straining or irregular stooling doen not mean constipation.The nb breast fed kid may go 7-10 days without a stool or poo a little at each meal.As long as it is soft, i don't consider that constipation. Their belly muscles are weak so they must use their breathing muscle/fuss & look odd to push out their poop. If the kid puts out dry bricks add full strength prune juice to feeds 1-3X/d to soften po