my baby is 3 months old.. last month he used to wake up in every 2 hrs for feeding and had proper feeding for 20 min. . but this month he spends less time in feeding not waking up by himself.. just spends 5 mind in feeding and then sleeps on my breast.. his stomach always looks like empty.. sometimes I sqeeze out milk to feed him.. what happened to him? what's the solution so that he ll drink sufficient milk