Babyfier

Babyfier/151 is a small light pink oddly sheep-like experiment with a big head with a baby-like face, purple insect-like wings, stubby legs, short stubby ears, plump cheeks, purple nose, a yellow pacifier in his mouth and a long baby rattle-shaped tail. He stands on 11 inches tall and weighs 24.3 lbs. Designed to disable planets by turning adults into babies with a pink powder shaken from his tail.

He was created by Jumba Jookiba and Dr. Jacques von Hämsterviel. In Stitch! The Movie, his pod was sent flying into Hawaii and scattered. The Unburned Ice Cream Tourist stood on his pod which caused it to fly into the sea and rehydrate him. He then turned the man into a baby.

Lilo and Stitch found him turning construction workers into babies and after Nani yelled at Lilo and Lilo wished she was older than Nani, Stitch freed Babyfier to make Lilo's wish come true. The plan worked, but Babyfier turned Stitch, Pleakley and Jumba into babies as well, forcing Lilo to look after them. Captain Gantu then found him and took him, only for Babyfier to turn him into a baby as well!

Source
Lilo and Stitch wiki