Preemie vs newborn

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Hi ladies, 

I am pregnant with triplets, I'll be 29 w tomorrown(yay!) and I'd like to know if it's really worth it to buy the preemie size in diapers. We received a couple of packets of newborn sizes so not sure if we need to stock up on preemie ones. I know the babies will be preemie but not sure if the diaper size is that different. TIA!  

 

Sorry for any misellings--doing this through the mobile site.