The new research shows that parents should sing to their babies more often because it really does have a positive impact on a child's mood—and it also can benefit the health and well-being of moms and dads too.

Published in the journal Child Development, the study from an international team of scientists from New Zealand, Canada, the US and Netherlands, looked at the results of using a music enrichment intervention program that encouraged caregivers to sing more frequently to their babies.

The study was conducted with 110 parents and their babies, who averaged around four months old—with most of the caregivers participating from the US and New Zealand being white, educated, and above the poverty line. Study participants were randomly assigned to the intervention or a control group for the main portion of the study which lasted six weeks.

Parents in the intervention group completed a brief, smartphone-based music enrichment program designed to help them sing more often to their babies. They were given access to six instructional videos of simple songs presented in karaoke style, with lyrics synchronized to a bouncing ball and sourced from vintage songbooks, specially made for caregivers with limited music training.

Additionally, participants received a child-friendly songbook that featured infant-pressable buttons which activated song playback, accompanied by illustrations and lyrics for parents to sing along.

Weekly email newsletters also introduced ideas of how to incorporate singing into daily caregiving routines and presented research findings relevant to the benefits of musical parenting.

Throughout the study, the participants completed smartphone surveys up to three times daily, reporting on both baby and parent mood, stress, sleep quality, and music use.

The findings reveal positive causal effects from simple, low-cost interventions—such as increasing baby-directed singing. The interventions improved health outcomes for both babies and their parents during the four-week intervention.

"Our main finding was that the intervention successfully increased the frequency of infant-directed singing, especially in soothing contexts, and led to measurable improvements in infants' general mood as reported by caregivers," said Dr. Samuel Mehr, of Auckland University, New Zealand.