Question

susan beals hypothesis about ______ led to a campaign that lowered the death rate attributable to sudden infant death syndrome (sids) significantly in several countries. putting babies on softer mattresses babies sleeping on their backs babies co - sleeping babies getting nothing but milk before bed

Explanation:

Research has shown that having babies sleep on their backs reduces the risk of SIDS. Susan Beal's hypothesis was related to this sleeping - position change. Softer mattresses, co - sleeping, and pre - bed milk intake are not the main factors in her hypothesis for reducing SIDS death rates.

Answer:

babies sleeping on their backs