Does it seem fair that nursing mothers should get a tax break, but parents who bottle feed don't?

From this article.

First of all, WHY? Why would one get a freaking tax break just for nursing?

Second, it’s just about free! You may need to buy a pump, but even if you buy a top of the line pump it’s still a hell of a lot less expensive than buying formula over a year.

Can someone explain the logic behind this to me?