Boon Nursh 4 oz. Silicone Bottle - SpeckleReduce Colic Symptoms: The clever design of Boon bottles features air free feeding that prevents gas and spit up with a pouch that collapses as baby drinks; no need for complicated vents or valves Safety of Silicone: The only thing your baby's milk comes in contact with is the 100% food safe silicone of the nipple and pouch; made without BPA or PVC Latch On: The Nursh baby bottle nipples are easy for your baby to latch on to with a shape and length