Except the mutants in X-men had incredibly dangerous powers and were overall better than humans (it was also an allegory for homosexuals blah blah blah). Unless this little one could shoot eyebeams or sprout claws, I don't see a (non-aesthetic) reason for killing it. I mean, it's not as cute as a Yurriku, but if her other kid is a Buri it must have pretty strange standards.