Menstruation refers to menstruation. 12 and a half year old girls can generally grow a few centimeters taller after menstruation, the specific growth of how much is affected by genetics, nutrition, physical exercise and other factors, can not be generalized. After girls enter puberty, with the hormonal changes in the body, height will grow rapidly, generally about two years after entering puberty, start menstruation. Most girls slow down after menstruation, and the height growth potential of a 12 1/2 year old girl after menstruation is about a few centimeters, but the exact value is variable. A girl’s height is affected by many factors such as genetics, nutrition, and physical activity. Genetic factors cannot be changed, while nutritional factors and physical activity can be altered artificially. After menstruation, if a girl increases her nutrition and participates in sports, she may grow taller.