I have 28 days old baby boy. my problem is that I have a flat nipple. I feed him with both breast milk as well as formula milk, since initially my breast milk level was low. but currently it's far better. my kid is not latching properly. he is not sucking the breast. as I know we need to feed baby atleast 40 min.but my kid sucks only for just 10 min,after that he falls asleep. please help me to solve the issue. Do I need to consult with doctor for solving the problem