Milk supply

Anna • 💙mama to noah💙 03/08/19

My baby was born at 10lbs and was 12lbs by two weeks so dr said it was okay if he slept for 4hour periods at night. During the day he wsnts to eat every 1 1/2 to 2 hours. But my boobs dont fully seem to fill up until 2 1/2hrs. Im able to express some milk before the 2 1/2 hour mark but he gets fussy, it doesnt seem to be coming out as fast as he wants? Please help