Let's look at the breakdown of the individual words.

`Wing` denote a structure used for flight, or at the least, stablization. They're often found on birds, angels, and airplanes. Typically they're used to convey a sense of movement, agility, ability in the sky, freedom, and range.

`Child` refers to a young adult human. Sex is irrelevant, since children haven't matured yet. Children can be used to represent innocence, which goes well with the `angelic wings` theme.