Last Updated
：2026/01/11
乳児期
Hiragana
にゅうじき
Noun
Japanese Meaning
乳児期とは、出生からおおよそ1歳前後までの、乳児としての発達段階を指す時期。 / 母乳やミルクを主な栄養源とし、身体的・精神的・感覚的な基礎が急速に形成される発達初期の段階。 / 寝返り、はいはい、つかまり立ちなど、基本的な運動機能が発達し始める初期の子どもの時期。
Easy Japanese Meaning
うまれてから一さいくらいまでの、まだとても小さいこどものじき
Chinese (Simplified) Meaning
婴儿期 / 乳儿期 / 婴儿阶段
Chinese (Traditional) Meaning
嬰兒期 / 乳兒期 / 出生後最初一年左右的階段
Korean Meaning
영아기 / 갓난아기 시기 / 생후 초기 시기
Indonesian
masa bayi / periode bayi / usia bayi
Vietnamese Meaning
thời kỳ nhũ nhi (giai đoạn còn bú) / giai đoạn thơ ấu sớm
Tagalog Meaning
yugto ng sanggol / panahon ng sanggol / yugto ng pagkasanggol
Sense（1）
infancy
（ canonical ）
（ romanization ）
（ kyūjitai ）
（ hiragana ）
Quizzes for review
See correct answer
Infancy is an important period for human growth and development.
Infancy is an important period for human growth and development.
See correct answer
乳児期は人間の成長と発達の重要な時期です。
Japanese - English
Word Edit Setting
- Users who have edit permission for words - All Users
- Screen new word creation
- Screen word edits
- Screen word deletion
- Screen changing entry name
- Users authorized to vote on judging - All Users
- Number of votes required for decision - 1
Sentence Edit Setting
- Users who have edit permission for sentences - All Users
- Screen sentence deletion
- Users authorized to vote on judging - Editor
- Number of votes required for decision - 1
Quiz Edit Setting
- Users who have edit permission for quizzes - All Users
- Users authorized to vote on judging - Editor
- Number of votes required for decision - 1
