baby - definition and synonyms

noun [countable] 

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  1. 1

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    a very young child who cannot yet talk or walk. A baby who is old enough to walk is a toddler

    May I hold the baby?

    their new baby daughter

    give birth to/have a baby:

    I’m hoping to have the baby at home.

    be expecting/having a baby (=be pregnant):

    She’s expecting a baby in November.

    1. a.
      [usually before noun] a very young animal

      a baby elephant

      baby seals

  2. 2
    informal the youngest member of a family or other group

    At 18, Owen was the baby of the team.

  3. 3
    someone who is behaving in a way that is weak, silly, or not brave

    Don’t be such a big baby!

  4. 4
    informal a project or piece of work that you care about a lot, especially because it was your idea

    Steve has always seen the book as his baby.

  5. 5
    spoken used for talking to someone you love, especially to someone you are in a romantic relationship with or to your child

    What’s the matter, baby?