Carly Allen, 7, sits on the tire swing at Hiawatha Elementary School on Wednesday, September, 18, 2013 in Hiawatha, Iowa. Allen has Sotos Syndrome, characterized by excessive growth in early childhood. (Adam Wesley/The Gazette-KCRG TV9) CEDAR RAPIDS — Though she’s 7 years old and learned how to, Carly Allen hasn’t ridden a bike, independently, for two years.She can sit in the seat and hold on to the handles as her mom, Lisa, pushes her around the yard.