S1E38 · My Mum's a Doctor

Po rides on her scooter in circles before the Magic Windmill spins and the Teletubbies watch a mother who is a doctor and Po has too much Tubby Custard and she gets Tubby Custard tummy. She doesn't feel very good because she ate too quickly and gets her case of hiccups so Laa-Laa comes in and realizes what is going on. Po tells her that she had eaten too much of her Tubby Custard. So Laa-Laa walks her to bed. She sings a lullaby to help Po sleep and feel better. After that, she feels much better and cannot eat too much Tubby Custard ever again