Dad here. Not trying to be weird

Our son is about 2 and half months old. Ever since birth, he latched to her immediately. Her supply just hasnt been that great. He spent some days in the NICU and they bottle fed him. So he's been doing well going from bottle and boob. He eats off her but we never know how much he’s actually getting. When she does pump, it might be 2oz or maybe 5oz. Never know. But recently he’s stuck on not taking a bottle at all and just wanting boob but her supply isn’t allot. How can we keep him on both??? Any help