A study released by researchers from the Johns Hopkins Bloomberg School of Public Health and coauthored by Dr. Lara McKenzie, a principal investigator at the Center for Injury Research and Policy, revealed that grandparent care is not associated with more childhood injuries. The study showed that having grandparents as caregivers can cut the risk of childhood injury roughly in half when compared to organized daycare or care by the mother or other relatives.
Press Release: Grandparents A Safe Source of Childcare - November 3, 2008
PubMed Abstract: Risk Factors for Unintentional Injuries in Children: Are Grandparents Protective? - November 2008