The phrase "small nipples" refers to a physical characteristic where one's nipples are relatively small in size compared to other people. Full definition
If you are looking for the best breast pump for small nipples, this is it. (babygearspecialist.com)
This breast pump is the best fit for working mothers with small nipples, but it doesn't mean that if you are not working, you should not use it. (babygearspecialist.com)
This way keeps the larger body of your baby away from danger when using a too small nipple. (shrewdmommy.com)