What?? Oh, hell no! Plastic surgery on a child for purely comestic reasons, and not to repair a facial flaw like cleft palette that severely affects the child's health is absolutely horrible. Facial surgery is extremely painful, the recovery takes (I understand) many weeks. To inflict this on a child just to make them "prettier" is the epitome of parental betrayal and frankly is child abuse. The "coverage" it provides of the child's condition is purely superficial, since a Down's Syndrome child will always have learning disabilities to varying degrees, which anyone who spends a moment conversing with them will immediately perceive.
This is not something that is being done for the good of the child. It's being done for the good of the parents. It should be illegal.