Definition of baby blue
1
: a pale blue
2
baby blues plural
: blue eyes
She's a zaftig woman, with long red hair and a pale rose complexion setting off those baby blues.— Michele Kort
3
baby blues plural in form but singular or plural in construction
: a feeling of sadness that is experienced by a woman shortly after giving birth, that is typically accompanied by other symptoms (such as mood swings, crying spells, and insomnia), and that usually lasts less than two weeks : postpartum blues
Baby blues isn't an illness or even a proper psychiatric diagnosis, it is simply a way that people have tried to describe unpleasant feelings that occur shortly after having a baby and tend to resolve in a few days.— Jackie Ganley
—usually used with the a case of the baby blues
— compare postpartum depression
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Merriam-Webster unabridged
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Time Traveler for baby blue
The first known use of baby blue was in 1859
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