How to Say “Baby Sister” in Japanese

赤ちゃん妹
akachan imōto
The Japanese phrase for "baby sister" is 赤ちゃん妹, pronounced akachan imōto.
This phrase refers specifically to a sister who is an infant or a very young child.

How do you pronounce it?

akachan imōto

Did you know?

  • The word 赤ちゃん for 'baby' literally means 'little red person'. This comes from the reddish color of a newborn's skin.
  • While 赤ちゃん妹 describes a baby sister, Japanese culture often uses the term 妹分 to describe a woman who is treated as a younger sister in a mentor-student or gang relationship.
  • In Japan, siblings rarely use the word 妹 when speaking directly to their sister. Instead, they use her given name or a nickname.

Examples in context

  • 私の妹ちゃんは赤ちゃんだよ。
    My sister is a baby.

Example conversation

Yota shows Yui a photo of his family.

  1. 陽太 Yota

    この子は僕の赤ちゃん妹です。
    Kono ko wa boku no akachan imōto desu.
    This child is my baby sister.
  2. 結衣 Yui

    本当にかわいいですね!
    Hontō ni kawaii desu ne!
    She is really cute!
  3. 陽太 Yota

    いつもたくさん笑っています。
    Itsumo takusan waratte imasu.
    She is always laughing a lot.
  4. 結衣 Yui

    いいお兄さんになってくださいね。
    Ii onīsan ni natte kudasai ne.
    Please be a good big brother.
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Crystal Ruth
Crystal RuthHelp make this guide better. Spot a mistake, know another way to say it, or have an example from real life? Share it below.
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