Precious cargo? Or uterine contents?

Click here to see a Consumer Reports web page on which an infant in a car seat is referred to as "precious cargo".

Click here to see a Consumer Reports web page on which a baby in the womb is referred to as "uterine contents".

A question for the editors of Consumer Reports (or for anyone else who cares to answer):  At what point does "uterine contents" morph into "precious cargo"?

Michael P.