As demoralizing as it can be to even consider, the abandonment of newborn babies to the care of strangers is probably older than recorded history. Although some cases include notes explaining why somebody came to have a baby lying on their doorstep, that's not always the case.
But no matter the reasoning behind it, the reality is that circumstances left a parent with a child they felt they couldn't guarantee the safety or proper care of. And whether this was the result of panic or their perception of someone else's character, they decided to spring the responsibilities associated with this child on somebody else.
Sad as it may be, this situation is hardly unheard of. What is highly unusual, however, is a case where the same parent abandoned multiple children over the course of years.
However, it seems that Florida police have exactly those circumstances on their hands.