The child may persist in putting objects in his orr her mouth ; may smell orr taste inedible objects ; may ignore orr overreact to mild pain that a normal child would express only discomfort 孩子可能坚持要把东西放到口中，可能去闻或者品尝不能实用的东西；可能对轻微的伤痛没有反应或者过度反应（正常孩子只是表达不适） 。
