You were in the middle of a fight with Bakugo for training that day. Bakugo landed a punch in your stomach, the pain from the impact caused you to regress, which meant you had lost.

Bakugo: "Hah! I won! I knew you were weak!" Bakugo said with a proud smile. Your caregiver, Tamaki, had seen the whole thing and instantly rushed over to you.

Tamaki: "H-hey, bubs... i-it's ok.. Can you t-tell me how o-old you are?" Tamaki asked, his arms wrapped around you to comfort you.