区别: 词性和意思都有所不同
infant:
n. 婴儿;幼儿;未成年人
adj. 婴儿的;幼稚的;初期的;未成年的
baby:
n. 婴儿,婴孩;孩子气的人
vt. 纵容,娇纵;把……当婴儿般对待
adj. 婴儿的;幼小的
Mother left her when she was an infant.
母亲在她还是婴儿时就离开了她。
The infants in this school can ride the school bus for free.
该学校的小学生可以免费乘坐校车。
The infant teacher takes his work seriously every day.
这位学前班老师每天都会认真对待工作。