We never used a crib bumper, and the world did not end!
Our daughter got her leg stuck in the crib slats twice, but we opted for the occasional incident (she yelled, we got her out) rather than suffocating. She would also wedge her head up against the crib slats (I think mimicking the womb/pressure) and would have a line on her head when she woke up, but that went away.
They do make netted crib bumpers which help with the limbs getting stuck, but we never ended up ordering it since it only happened twice (she figured out on her own not to do it again).
good luck!
Updated
We never used a crib bumper, and the world did not end!
Our daughter got her leg stuck in the crib slats twice, but we opted for the occasional incident (she yelled, we got her out) rather than suffocating. She would also wedge her head up against the crib slats (I think mimicking the womb/pressure) and would have a line on her head when she woke up, but that went away.
They do make netted crib bumpers which help with the limbs getting stuck, but we never ended up ordering it since it only happened twice (she figured out on her own not to do it again).
good luck!