Hi my 7 year old daughter has had calf stiffness in the mornings, she has mentioned it a few times over the last 4 weeks but yesterday she was unable to even stand up yesterday in the morning for about 10 mins and looked a bit uncomfortable for the rest of the day. This morning she was stiff but not as bad as yesterday. It is both legs and she is very active with dancing classes which she has been doing for 4 years.