I stopped breastfeeding him at 13-14 months. He started to wean himself. He still drinks milk in a bottle (I know it’s bad-I’m working on it!)

But lately he will just come up to me and move my shirt over and smile, sometimes he even puts his mouth on my nipples and sucks...it’s really strange! I’m pregnant with baby number 2 but right now he’s an only child.

Is this normal? How should I handle this?