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Find girls' one pieces at up to 90% off estimated retail prices when you shop at thredUP. Get pre-loved items from your favorite girls' brands, like Baby Gap and Carter's.

One-PiecesRemove filter9-12 moRemove filter
4 items
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    Mud Pie One Piece Swimsuit (view 2)Mud Pie One Piece Swimsuit (view 1)
    View Product: Mud Pie One Piece Swimsuit

    Mud Pie

    One Piece Swimsuit
    Size 9-12 mo
    $9.99 $7.49 25% off with code THRIFT25
    54% off estimated retail
    Mud Pie One Piece Swimsuit (view 2)Mud Pie One Piece Swimsuit (view 1)
    View Product: Mud Pie One Piece Swimsuit

    Mud Pie

    One Piece Swimsuit
    Size 9-12 mo
    $11.99 $8.99 25% off with code THRIFT25
    45% off estimated retail
    Tea One Piece Swimsuit (view 2)Tea One Piece Swimsuit (view 1)Price Drop
    View Product: Tea One Piece Swimsuit

    Tea

    One Piece Swimsuit
    Size 9-12 mo
    $18.99 $14.24 25% off with code THRIFT25
    60% off estimated retail
    Disney One Piece Swimsuit (view 2)Disney One Piece Swimsuit (view 1)Price Drop
    View Product: Disney One Piece Swimsuit

    Disney

    One Piece Swimsuit
    Size 9-12 mo
    $9.99 $7.49 25% off with code THRIFT25
    52% off estimated retail
    The Edit. Forever Classic, Get perfectly polished in trousers, blazers, and more. Shop The Edit
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