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