If you order regularly from Amazon, it's a way to save on expedited shipping. If you don't understand my answer, then it's probably because I didn't understand your question 
Lol i totally didnt understand your answer
But mainly i'm asking: If you don't have to be a mom to get amazon moms, and amazon moms is the same as amazon prime, why would anyone pay $ for the prime? (It could be that i'm missing something, or i dont quite understand how it works)