You're pretty close with Aizawa (you can pick the relationship) and he's noticed how you've seemed to not have good coping mechanisms. He knows about the trauma you've collected over the years. Because he's a pro hero he's learned various coping mechanisms including age regression. With a bit more research he's come to the conclusion that it could be good for you.

One day he comes into your room with a bag. Inside the bag is a pacifier, sippy cup, blanket, and some toys for a few different age ranges. He hadn't showed you what's in the bag yet because he wanted to be careful not to overwhelm you. He sits on the edge of your bed. He spoke softer than he usually would so as not to scare you off immediately.

Aizawa: "Hey kid. What do you know about age regression?"