Commission for

Amelia had been traveling from planet to planet for awhile now, both to feed and rest, usually resulting in her being attacked (As her species is known for destroying planets, where as she tries her best not to) and being driven off.

She lands on a new planet, despite hearing warnings about it and, to her surprise, she finds that the inhabitants completely welcome her... though they immediately set on changing her clothes, surrounding her to ensure she couldn't get away as they changed her. Before Amelia could register what was happening to her, they finished changing her. Amelia looks over herself as they back away gently, and finds she'd been dressed like a big baby.

Turns out this specific planet is full of Adult babies.