Cousins baby turned into minnow

My family and I were visiting my aunt and uncle’s house and my cousin, her husband, and their toddler were there. My cousin and her husband super casually told us that the baby had started doing this new thing where he turns into a ladybug or a little fish when he doesn’t want to do something you tell him. It was time for him to take a nap and he didn’t want to so he turned into a minnow. I picked up the minnow and was holding him in my hands and said “where the heck do I put him!?” So my cousins husband said “It’s cool just pop him in this aquarium we take with us everywhere.”