Encouraging Physical Activity in Infants Author:Steve Sanders Babies are naturally active, and their movements help them explore their environment. Caregivers and parents can encourage their muscle development, strength and balance with simple activities done with infants as young as six weeks old. From tummy time to crawling, scooting and standing, the first year of life lays the foundation for further de... more »velopment of gross motor skills as a toddler and preschooler. So get those little bodies moving!« less