Babies? Seriously?--SPOILER
Sooo...the serial killer snatched hookers so he could impregnate them and take their babies?
The baby part is what makes this so unrealistic. They show you a nursery of infant incubators containing at least three kids. One of those kids is from the paralyzed girl's rape by the black nurse. And she tells us she's been there 3 years. Now if she was taken from the hospital when she was first pregnant, and had the baby in the basement sometime thereafter, that particular baby would have been older than 2. When you see the half b&w baby in the incubator, it's definitely younger than 2 (trust me, a 2YO would NOT lie around in an incubator all day).
Next, ONE baby is a full-time job. Constant feeding, changing, attention giving...much less THREE. Cafeteria worker man wouldn't have time to snatch those girls between taking care of all those kids. And psycho cop girl wouldn't have had time between working and scheming.
Are we to believe he drugged the babies to make them sleep all day (or during his shift)? I suppose that is possible if he was stealing all those meds from the hospital.