Extra nipples—where did THAT come from?

Some girls have more than two nipples. These are usually smaller than the breast nipples and do not produce milk when a woman is pregnant. The extra nipples are usually lower down on the body than the two "normal" nipples.

How do extra nipples get there? Well, during development, all fetuses develop a milk "ridge" down the length of the body. This ridge has a lot of nipples. Most people lose the ridge, and all but the two breast nipples, before they're born. But in other mammals (like dogs, for example) the ridge usually remains, and that's why they have a few nipples in a row.

If you have extra nipples, it just means that you didn't lose one of the nipples on the milk ridge before birth. If it bothers you, you should talk to your parents because extra nipples can be removed by a doctor. Like most things, you're probably more likely to notice it than anybody else.