Hai My Lo is 3 months and 8days old.. he weight is about 5.3 around he is both breast feeding and formula I give formula for 3times a day not more than 40ml.. he drinks formula around 11 in the night and breast feed for 20mints and sleeps later he won't wake up at all I should only wake him up after 3-4hr to feed but still he drinks for 20mints and sleeps back..Is this normal? Babies usually will awake for feed but he doesn't