Prince lionheart colic reducing silicone baby bottle is free from bpa phthalate pvc latex amp lead just pure silicone which has no open pores to harbour bacteria how it works slowly squeeze excess air out of bottle by pinching nipple while squeezing bottle until liquid level reaches top of nipple the bottle will collapse as air is released most bottles with venting holes allow air into bottles as babies drink prince lionheartrsquos silicone bottle collapses as air is released giv