Lullaby Earth breathable crib mattresses provide more airflow than traditional non-breathable crib mattresses according to independent tests.  The practical approach to breathability is effective without sacrificing hygiene.

According to the CPSC, babies should be put to sleep on their backs to reduce the risk of SIDS. However, there will likely come a time when your baby will turn face down in his or her sleep. That's when having additional airflow under the baby may be helpful. This can also improve temperature regulation and reduce overheating.