学为贵:百度百科里的“婴儿”是指小于1周岁的儿童，而“婴幼儿”则是指0-3岁的小龄孩子。常见的关于婴幼儿的词就是baby和infant：

baby

N-COUNT a very young child,especially one that cannot yet walk or talk

婴儿

——柯林斯英汉双解大词典

test-tube baby

试管婴儿

She spooned the milk to her baby.

她用匙给她的婴孩喂奶。

infant

N-COUNT a child during the earliest period of life(or still unborn);now most usually applied to a child in arms,a babe;but often extended to include any child under seven years

婴儿；幼儿【学为贵】

——Oxford English Dictionary

prematurely born infant

早产婴儿

The family were forced to flee with their infant son.

那家人被迫带着他们尚在襁褓中的儿子逃走了。

infant的含义还是比较广的，既包括未出生的胎儿，也包括尚在襁褓中的初生儿，还包括7岁以下的幼儿。除了baby和infant，通过寻找同近义词的途径，我们还能找到更多的表达：

nursling

N.a child or young animal that is being suckled,nursed,or fostered

被喂奶、照料和养育的婴儿;被喂奶、照料和养育的小动物

——柯林斯英汉双解大词典【学为贵】

The earth is the mother of all of us and we are her nurslings.

地球是我们所有人的母亲，我们是她嗷嗷待哺的婴儿。

小知识：nursling由nurse+ling构成。nurse意为“照顾、给…喂奶”；ling是表示“微小”的词缀。nursling则意为"the object of a nurse's care"，即被照料、被喂养的对象，也就是指婴儿或者小动物。

suckling

N.an infant that is at the breast or is unweaned

乳儿；尚未断奶的小儿

——Oxford English Dictionary

Take him seriously;he is not the suckling he was two years ago.

不要小看他，他已不是两年前那个乳臭未干的小子了。

小知识：suckling由表示“吮吸”的suck加上形容“微小”的词缀ling构成，意为"infant at the breast"，也就是指还需要喝奶的小孩子。【学为贵】

toddler

N.a young child who has only just learned to walk or who still walks unsteadily with small,quick steps

幼儿；学步的小孩

——柯林斯英汉双解大词典

Yesterday a friend of mine brought her toddler to visit.

昨天我的一个朋友带着她蹒跚学步的孩子来作客。

小知识：toddle是动词，意为东倒西歪地走路，而toddler是toddle的施动者名词，也就是指蹒跚学步的小孩；toddle本身也可以表示刚学走路的小孩。

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