Studies have shown that girls and boys really do throw differently from a very young age. Read related article
Sources: Sources: Jerry Thomas, dean of the College of Education at the University of North Texas; “Motor development and skill acquisition during childhood and adolescence,” by Thomas, K.T., Gallagher, J.D., & Thomas, J.R. in Handbook of Sport Psychology (second edition) | Alberto Cuadra and Bonnie Berkowitz - The Washington Post 
