Baby hair yellow soft and sparse may be related to genetic factors, but also may be related to the lack of nutrients, such as calcium, zinc and other factors. 1. Genetic factors: baby hair yellow soft less may be related to genetic factors, such as both parents if the hair is not much, the baby’s hair will be affected by genetic factors. 2. lack of nutrients: baby if the body lacks calcium and zinc, may also appear the above symptoms, but also accompanied by excessive sweating, baldness, night terrors, decreased appetite and other bad hair should. Baby hair yellow soft sparse there may be other reasons, it is recommended that timely to the hospital for relevant examinations, clear cause of the disease after active symptomatic treatment.