Cradle To Grave - [s5e5]

Subplot-wise, this episode features Chief Hotchner being unusually hard on Derek Morgan, a move later revealed to be a test to see if Morgan is ready to lead the team.

In a tense climax, JJ and Prentiss lead the charge into the Reinman home to rescue the surviving women and babies. [S5E5] Cradle to Grave

The couple is trying to "replace" their lost son. They keep the male babies that meet their specific criteria and discard the mothers and "imperfect" infants. Why It’s Notable [S5E5] Cradle to Grave