A "teat" is a small, soft, and nipple-like part of a mammal's body, usually found on female animals, which they use to provide milk to their babies. Full definition
The SpecialNeeds Feeder can be used with teats of two different sizes. (medela.com)
I love that Tommee Tippee makes slow flow teats for the bottles, this is especially great if you are trying to get back to breastfeeding or duel feeding. (powerfulmothering.com)
Of course he's also going to need bottles to feed the baby so you may decide to go for a sterilizer or set of faster flow teats for the baby as it gets older. (best-baby-gift-ideas.com)