child's body
Noun
Meaning
the body of a human child
Source: WordNetHypernyms
Examples
I was never a child. I was always a menopausal woman within a child's body.
A lot of people like to be supertiny, but I don't want a child's body - I want a woman's body that is extremely fit. It's so much sexier.
The biological goal of the existence of every organism becomes understandable when we realize that it acts as a protector of genes worn in it, which must ensure that they move into the child's body before the caregiver himself becomes old and can not function properly.