If your baby eats only one hair, it does not matter, if it is still in the mouth, pull it out by hand, if it has been eaten inside the stomach and eaten only one no big problem, because the hair itself is not harmful to the human gastrointestinal tract, there is no toxicity, generally with the gastrointestinal peristalsis with the stool from the anus out of the body without much effect. Just pay attention to the future care of children to be particularly careful, not to let the baby always grab something stuffed into the mouth to eat in, if the hair to eat more may form food clumps in the digestive tract, easily lead to blockage caused by gastrointestinal digestive discomfort, if there are symptoms to the hospital to see the pediatric gastroenterology specialist clinic or pediatric outpatient clinic to deal with.