Jennifer McDonel-Rivers and David Rivers have made children’s music together for years. And it’s led to one happy marriage and multiple albums of educational songs that kids love and parents don’t hate. Plus: Preterm babies are at a higher risk for autism and other developmental delays. Meghan Puglia studies how certain stimuli like touching, reaching, and talking can help improve outcomes for little ones in the NICU.Later in the show: After more than two decades as a social worker, Christa Moore was overloaded with burnout and compassion fatigue. Now she’s leading a nationwide study on the child welfare system. She says much of the issues still plaguing the system feel very familiar.