NippleThe soft, flexible part the baby sucks from. Also called a teat.
BottleThe container that holds the milk, also called the body.
CapA cover that goes over the nipple to keep it clean.
CollarA ring that goes over the nipple and screws onto the neck.
Nipple holeThe opening at the tip of the nipple. The milk flows through it.
NeckThe narrow top of the bottle. The collar screws onto its thread.
Sealing discA flat disc that sits under the collar and seals the bottle.
Storage cap and liner 2
Storage capA flat screw lid for storing milk. It replaces the collar and nipple.
LinerA soft disposable bag that holds the milk inside a holder.
How this list was compiled: Every name checked on 2026-10-01, a name kept only where two independent sources use it. (1) Wikipedia, Baby bottle, https://en.wikipedia.org/wiki/Baby_bottle (a typical baby bottle has four parts: the main container or body; the teat, or nipple, the flexible part the baby sucks from, which contains a hole through which the milk flows; the collar, which fits over the nipple and usually screws on the bottle's neck; and a cap or travel cover that fits over the teat. Some bottles have a disposable liner; a storage lid may replace the ring and teat). (2) One bottle maker's published questions and answers, https://www.drbrownsbaby.com/pages/faq, for part names only (nipple, collar, cap, travel disk, bottle vessel, storage travel cap, narrow and wide-neck bottles). (3) U.S. Department of Agriculture, Infant Nutrition and Feeding: A Guide for Use in the WIC Program, https://wicworks.fns.usda.gov/sites/default/files/media/document/infant-feeding-guide.pdf, for names only (nipple, nipple hole, nipple ring, disposable bottle liners). (4) A 1953 mail-order catalog read through the Internet Archive's full-text search, https://archive.org/details/1953-sears-spring-summer-catalog_202307 (bottles sold with nipple, cap and sealing disc). Licence: own work
The drawing: Drawn for this site on 2026-10-01 from plain geometry; no maker's product, nothing traced. Licence: own work
How it works
A baby bottle comes apart into a few pieces: the bottle, the nipple, the collar that holds the nipple on, and a cap over the top. This drawing lays them out in order and names nine parts.
Read the full guide
From the top down
The cap covers the nipple. The nipple is the soft part, with a hole at its tip. The collar is the ring that goes over the nipple's wide base and screws onto the neck of the bottle, clamping the nipple in place. A sealing disc, where a bottle has one, lies flat under the collar to close the bottle for carrying.
Two pieces from other bottles
The flat storage cap screws on in place of the collar and nipple. The liner belongs to a different kind of bottle: a soft disposable bag that holds the milk inside a holder.
Names differ by maker and country: teat for nipple, ring for collar, hood for cap. The answer box takes them all.
Questions and answers
What are the parts of a baby bottle called?
The bottle itself, also called the body; the nipple, or teat; the collar, a ring that screws the nipple onto the bottle's neck; and a cap that covers the nipple. Some bottles add a sealing disc, a storage cap or a disposable liner.
What is the ring on a baby bottle called?
The collar. It is also called the nipple ring or screw ring. It goes over the wide base of the nipple and screws onto the thread on the neck of the bottle.
Is a teat the same as a nipple?
Yes. Teat is the usual word in British English and nipple in American English for the soft part of the bottle that the baby sucks from.
What is the flat disc that comes with a baby bottle?
A sealing disc, also sold as a travel disc. It sits flat under the collar and closes the top of the bottle so that it can be carried without leaking.