Nuk first choice latex teat is a replacement latex teat for use with the nuk first choice bottle system size 1 for babies 0 6 monthsscientifically researched nuk orthodontic shape helps promote good digestionnew extra wide lip support helps baby to make a natural milking action and simulates breastfeeding as closely as possiblenuk developed air system allows a flow of air into the bottle through a tiny vent helping to prevent the swallowing of air thought to be a common cause of colic it