Dr. Browns narrow mouth teats were designed in conjunction with medical professionals and are made from medical grade silicone. Narrow mouth teats have a narrower, more flexible shape to allow the baby to latch on comfortably.Features:- Narrow mouth;- Teat is 100% medical silicone;- Narrower, more flexible shape;- Allows baby to latch on comfortably;Technical information :- Material: Silicone;- BPA free;- Includes: 2 teatsGeneral information:Available levels depending on the baby's approximate age:- Level P: 0m+ (Designed for premature babies);- Level 1: 0m+;- Level 2: 3m+;- Level 3: 6m+;- Level 4: 9m+;- Level Y: 9m+ (Recommended for thick liquids and cereals).