如果是泛指的，不确定的，如“她有个一岁的宝宝”。那英文就是：She has a one-year-old baby. 如接着说，那个一岁的宝宝开始喝稀饭了。那英文就是：The one-year-old baby has started to drink porridge.
用a， one-year-old 视作形容词用的
