How much do baby nurses cost?

You mean neonatal? Do you mean the nurses that take care of babies in the hospital? Or do you mean private duty nurses that help take care of babies in the home? With both answers it depends what part of the country/world you are in, how much experience nurse has, & what the work circumstances are. A nurse who works the night shift, might be paid more than one who works the day shift, because fewer want nites.