Crib Mattress Pad Crib Mattress Pad? Need Or Not?

Crib Mattress Pad? need or not? - crib mattress pad

I read about SIDS, and said the bed should not be too soft for a baby. We do not have the mattress is not it? And if we do not need it when she was a baby, when you with the application? wut age (or months)?