Nuk first choice bottle is bpa free and comes with silicone teat and is suitable for all infant feeds and breast milk so that your baby feels contented both during the nursing period and after weaning featuresan orthodontic nuk teat with extra wide lip support with the trusted nuk air system which helps to minimise infant colic caused by harmful swallowing of aireasy identification of teat hole size on base of teateasy grip screw ringsnap on closure the cap snaps audibly in placesealing