A milk baby refers to a socially inept rich male who resorts to paying others to teach them either through online tutorial, book or video, how to attract women. The teacher is thusly "milking the baby".
An alternative for males to having a sugar momma, in this manner a male is more capable of usurping their superiority and dominance over the milk baby.
"Dude keep your milk baby in check, he's getting creepy."
The milk baby watched from afar, taking mental notes of the techniques to woo women from his teacher.