Short femur may be related to calcium deficiency, underdevelopment and genetic factors. 1. Calcium deficiency: Short femur is most likely caused by calcium deficiency during pregnancy. Normally, you should supplement calcium and high-quality protein, and sunbathe every day, about 20 minutes of exposure a day can get among the adequate vitamin D, which is conducive to promoting calcium absorption. 2. Incomplete development: short femur is likely to be caused by fetal underdevelopment, pregnant women should do a good job of monitoring the health of the baby and their own, if any discomfort timely medical care. 3. Genetic factors: genetic factors lead to congenital short femur, will have an impact on the height of the baby born, because the acquired nutrition has exceeded the innate influence. After the baby is born, try to drink more milk, more calcium, strengthen physical exercise is very helpful to the height. No matter what the cause of the short femur, should be timely to the regular hospital to consult the examination, clear diagnosis to identify the cause, by specialists for the cause to take appropriate treatment.