There are two major problems associated with most traditional baby bottles58 air and vacuum traditional and restrictive vented bottles tend to develop vacuums because babies have to suck progressively harder on the one hole in the bottle to obtain the liquid this causes teat collapse and baby has to stop feeding air enters the bottle when the teat reinflates 58 this air is ingested and can cause colic symptomsthe dr browns options 8482 baby bottles feature a unique system with a re