Hi my DD is 4 weeks. She was having about 3 oz every 3 hours from 2 weeks to now. Since 2 days she is falling asleep after having 1oz to 2oz. So half of what she was having. She is also taking upto 45 mins to have this..after her first burp she literally doesnt suck on the bottle or pushes it out whilst sleeping. i am currently using size 1 mam teats in mam bottles.