某男孩,四岁,足月顺产,产程正常,出生体重3.75公斤,出生后头发黑而多。生后第三个月发现后枕部出现密集的红色头发,最后发展到全头。伴有贫血,无惊厥,无呕吐,经常腹泻。体格发育及智力发育均正常。营养情况好,面部及眼结合膜稍苍白,头顶部脂溢性皮炎,其他正常。母乳喂养, A boy, four years old, full-term natural delivery, normal labor, birth weight 3.75 kg, black hair after birth and more. After the third month after birth, there was dense red hair in the occipital area and eventually developed to the whole head. With anemia, no convulsions, no vomiting, frequent diarrhea. Physical development and mental development are normal. Good nutrition, facial and eye with a little pale, head seborrheic dermatitis, the other normal. Breastfeeding,