英语翻译If I don't stay off my feet,will it be harmful to my bab

off ones feet有躺着和不能控制自己的意思,这里感觉像是一个孕妇说的话,
如果我不好好躺着,有可能对我的小孩儿（胎儿）和我的健康有害吗?
例句：He was told by the doctor to saty off his feet as much as possible.医生叫他尽可能躺着.