Prop the baby, not the bottle.
D001942:Breast Feeding; D003679:Deglutition; D005064:Eustachian Tube; D006801:Humans; D007223:Infant; D007224:Infant Care; D007227:Infant Nutritional Physiological Phenomena; D010033:Otitis Media / Q000209:etiology; D011187:Posture