Always talk with your doctor about your child’s progress. Children who were born prematurely reach milestones later. There’s a wide range of what’s considered normal, so some children gain skills earlier or later than others. Children between 6 and 12 years old will begin valuing friendships and become more involved in activities like sports and/or painting.ĭoctors use certain milestones to tell if a child is developing as expected. As kids grow from grade-schoolers to preteens, you can expect many changes from their physical appearances to their favorite activities.