病史摘要:女,3岁5个月。因智能低下就诊。第一胎,足月妊娠,因前置胎盘行剖腹产。出生时无窒息,出生体重2,650g。母乳喂养。6月会翻身,10月会坐,1岁认识父母。3岁会走路,至今不能说话,仅能说二个字,如妈妈、爸爸等。不会自己饮水及吃饭,大小便不能表示,常伸舌流涎。出生时父29岁,母29岁,非近亲婚配,智力正常。母为 History Summary: Female, 3 years and 5 months. Low intelligence due to treatment. The first child, full-term pregnancy, caesarean section due to placenta previa. No asphyxia at birth, birth weight 2,650g. Breastfeeding. June will stand up, will sit in October, 1-year-old meet their parents. 3-year-old will walk, so far can not speak, can only say two words, such as mother, father and so on. Will not drink their own water and food, urine can not be expressed, often drooling. 29 years old at birth, 29 years old mother, non-relatives marriage, intelligence is normal. The mother is