Crib bumpers....yay or nay?

Amber 🐾🍸🍁 • Aidyn's Mommy
We just got an amazing crib from my MIL and a few weeks ago a friend gave us her old crib bumpers. I love them because they go with our Winnie the Pooh theme but I hear bad things about crib bumpers and SIDS. Anyone have some advice? Also, the directions on the crib say you shouldn't even put an infant under six months in it....why?! We have a basinet but the crib is so nice I'm kind of excited to use it. FTM here. Help! Thanks, guys 💞