乳にゅう児じ期き

noun

infancy; babyhood

Refers to the developmental stage of a human infant, typically from birth to around one year old. Often used in medical, psychological, or educational contexts. Compare with 幼児期 (early childhood).

See also: 幼児期

• 乳にゅう児じ期きの栄えい養ようは、その後ごの成せい長ちょうに大おおきく影えい響きょうする。

  Nutrition during infancy greatly affects subsequent growth.

• 乳にゅう児じ期きに適てき切せつな刺し激げきを与あたえることが大たい切せつだ。

  It is important to provide appropriate stimulation during babyhood.