Castle: (referring to the baby) I think Lanie's right. I think he is hungry. Um, how about you finish up here? I'll grab a uniform, and we'll just go pick up some stuff for him?
Beckett: You really want to do that?
Castle: Of course. Highly qualified. I have an R.H.D. in child care.
Beckett: And an R.H.D. is...?
Castle: Ruggedly handsome dad.