Baby hair after shaving there are places do not grow may be physiological hair follicle development stagnation, calcium and zinc deficiency, scalp bacterial infection and other factors related. 1. Physiological factors: the baby hair after shaving the place does not grow may be physiological follicle development stagnation, this and hereditary have a certain relationship. 2. Calcium and zinc deficiency: infants who lack calcium and zinc in their bodies will also experience the above symptoms, accompanied by excessive sweating, night terrors, decreased desire to eat milk and other adverse reactions. 3. Bacterial scalp infection: Bacterial scalp infection in infants will not only cause hair not to grow, but also lead to itching and increased dandruff. There may be other reasons why the baby’s hair doesn’t grow after shaving, so it is recommended to go to the hospital in time for the relevant examination, to clarify the cause of the disease and then actively treat the symptoms.