Is the height of a child affected by gymnastics ??

Gymnastic: yes. It can. Repeated injuries to the growth plates make gymnists at risk of stunting their growth, especially if all the injuries occur before growth plates close

Maybe: Possibly if your child is training too hard. At the Olympic level, training is such that these girls have delayed puberty, very low body fat and reduced puberty hormones which reduce growth, bone mass and possibly final adult height. However, limited research has yet to establish a cause- effect relationship between the two. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3751410/ Endo docs?