It Comes out of The Tubby Custard Machine. It is unknown that where the Tubby Custard comes from the machine.Tubby Custard is quite messy that the Teletubbies have to wear bibs when having Tubby Custard. There are many incidents where the Teletubbies spill there Tubby Custard or make too much. In "Urban Birds," Dipsy spills the Tubby custard over his seat and doesn't want to sit in it. In the episode "My Mum's a Doctor" Po eats too much Tubby Custard and gets Tubby Custard Tummy which makes her hiccup and have a Tummy Ache. When she also spills it on the floor, Tinky Winky once slipped in some Tubby Custard and the Tubby Custard machine once made too much Tubby Custard and flooded the house, the Tubby Custard Machine even made Tubby Custard Bubbles. Tinky Winky follows the trail to see who spilled the Tubby Custard. The Teletubbies love Tubby Custard.