my baby 3.5 months old is refusing to feed from my breast since 2 weeks..it has been a struggle, only while she is asleep she feeds...today I tried expressing the milk and feeding through a bottle and though it was her first time she drank the milk with ease...what could be the reason and is it ok to pump and feed the baby... Also..please let me know how much ml of milk should a baby of this age be fed and the time interval