Hi dear, baby's reflex for sucking comes with Hunger and as you know, everybody must get hungry. Your baby is not sucking because of either of the following. The position of the baby while breastfeeding, Are you feeding properly, Is the baby passing stool. If you don't position the baby's head well with your breast, milk will not flow when it sucks and your body has been designed by God to produce milk according to baby's demand. So you do the math. Google breast feeding positions..