These indoor activities are designed to boost your 1-year-old's growing skills. Between his newfound ability to walk and constantly improving language skills , your 1-year-old is so much fun to spend time with—which is important, because your interactions with him are essential to her development. "Between 12 months and two years, kids are starting to do things on their own, seeing cause and effect, and actively engaging with others in their environment, " says Robert Myers, Ph.D., a child and adolescent psychologist, founder of the Child Development Institute, and assistant clinical professor of psychiatry and human behavior at the University of California, Irvine School of Medicine. "Parents stimulating them, interacting with them, teaching them things, and exposing them to age-appropriate challenges and experiences is very important to encouraging development, and to the children exploring on their own and learning from interacting with their environment....