Familiars
Babies, even alien ones, need looking after and when it comes to choosing parents they stay true to form.
Take a look at the two below. These poor unfortunate fellows were normal before the babies got to them. As their will was twisted so were their bodies. Now these sideshow freaks are the brainless automaton servants of the encroaching alien spawn.
If you spot anyone that looks this repulsive, don't take any chances. Follow them home and look through their windows and stuff. Look for the tell-tale blue-green flesh of the alien baby they are sure to be harbouring. Report the sighting to us or take matters into your own hands.