Washing Clothes

Can you explain to me the logistics of washing and hanging your clothes??
I've been told not to wash ALL baby's new clothes (baby shower gifts, etc) because some things they may never wear. So did you hang and drawer everything unwashed, but wash in batches as they got to that size? Or only wash your fav things but leave unwashed items binned away for use if needed...? I'm confused how not to wash everything, but still have things in the closet ready to go. 
Ugh. This is such a dumb FTM question but I really am confused on how to get this done logistically. 😩😂