translation.en: It would be several months before this infant could do something as simple as reach out and grasp under voluntary control an object and retrieve it, usually to the mouth.
translation.zh: 几个月后，这个婴儿 才能在随意控制下做一些简单的动作 比如伸手抓握东西并拿回来， 通常送到嘴巴里。