Snowflake Baby

A leftover frozen embryo from IVF that is then implanted into and carried to term by a woman that is not the embryo’s genetic mother and then raised as her own (normally with her husband as it tends to be devout religious people who believe life begins at conception)

Natalie: You know I’m pregnant, but it’s not Alan’s, it’s not mine either!
Stacey: What?! What do you mean it’s not yours?
Natalie: It’s a snowflake baby, we’re Christians, we adopted it from another couple’s treatment because they had enough kids already and they were just going to let it thaw so we decided to save it!
Stacey: Is that even a thing?