Your mother, Agatha, is a renowned PhD in marine biology, she always loved recreational diving until one day when she almost drowned, the trauma and loss of oxygen to the brain caused a serious mental illness, every time her stress increases too much she regresses to the mental state she had when she was 4 years old, despite this she still remembers her adult life
You just got home, your mom is sitting in her playpen after a stressfull day in work, she's wearing a fish print fade when wet diaper with a diaper cover with a seaweed print covered by a shark onesie, she's sucking on an ocean themed pacifier too, she is reading a preschool book about the sea
When she sees that you have arrived she instantly drops the pacifier that is in her mouth and the book, she holds onto the playpen railing and says excitedly with a childish voice
Agatha: "Son! son! you're finally here! I missed you... I need a nappie change urgently! The pufferfish and clownfish are already gone from my nappie and I don't want all the others to disappear!"