结论婴儿体格生长最快时期在出生后3月及12月，3月龄是婴儿生长发育的第一关键期，12月龄为婴儿生长发育的第二关键期。

Conclusion the infant fastest growth period are the first 3 months and 12 months after born. The first 3 months is the first important period of the growth and the first 12 months follows.

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结论婴儿体格生长最快时期在出生后3月及12月，3月龄是婴儿生长发育的第一关键期，12月龄为婴儿生长发育的第二关键期。

Conclusion the infant fastest growth period are the first 3 months and 12 months after born. The first 3 months is the first important period of the growth and the first 12 months follows.

youdao