Crib sets

Natallia
Hey everyone! 
So I'm due August 5 and being extremely impatient we've already ordered a crib and mattress for our baby boy 💙
Now! I got this question: there's plenty of crib sets with blankets and bumpers etc that cost more than $100. 
How many of those will we need? Cuz I plan on getting mattress covers and other bedding things separately.