Girls with long hair in principle has no obvious effect on the growth and development of height, because the growth of height is mainly rely on the bone epiphysis ossification and cartilage bone, keep long hair can not affect the bone metabolism, so the impact on the height is not obvious, but the long hair in daily life will bring a lot of inconvenience, but also easy to cause accidental injury, at the same time, the long hair will also aggravate the protection mechanism of the shoulder and neck, which will cause the strain of the shoulder and neck. Due to the long hair in daily life, it is also easy to cause accidental injury or strain on the shoulder and neck, which will also adversely affect the growth and development, so try not to keep long hair for girls during the growth and development period if there is no special requirement.