What did you do with the blanket? Does your LO just sleep on top of the blanket?

I'm worried about safety and reducing the risk SIDS.

I found this...

According to the American Academy of Pediatrics (AAP), soft bedding in a crib – like blankets and pillows – increases of the risk of suffocation or sudden infant death syndrome (SIDS). Safe alternatives to blankets are sleepers, sleep sacks, and wearable blankets.

I'm actually wondering if I need to register for a bedding set. Couldn't I just get/ask for a crib sheets?