Quote - > Quote - B). Children do not have a bust line. A bust develops during puberty - after which the 'child' is a child no more.

for legal purposes a child is a child until reaching the age of 18 (most common age of "maturity").

puberty occurs prior to age 18.

Just to point out a rather large flaw in what you just said..... the legal age of consent, ie the age at which an individual is legally responsible for their own actions,  is NOT 18. Not even in the dear ole US of A!!
18 years of age is the legal age of consent in only 15 of the States in the USA. Most of the remaining states stipulate either 17 or 16, and in 3 cases (Iowa, Missouri and South Carolina) the age is actually 14.
The rest of the world varies a lot, with the age ranging from 12 to 20 (or sometimes none at all) with the average being about 16.

Also, just on a side note your comment about paedophile's preferences seems to be ignoring the fact that quite a large proportion of said paedophiles are homosexual.