Baby melancholy means "the sadness of some women after giving birth".
This idiom existed before the Second World War.
At first, this idiom was used to describe a baby's eyes at birth. This is because when babies are born, the amount of pigment in their eyes is very small, so most babies are born with blue eyes.
19 18, there is a passage in the novel Wind of Opportunity by American writer Rex Ellingwood Beach, which shows that the meaning of baby blues used to refer to the baby's blue eyes, namely:
Fix yours? Baby blues? Watch me approach on the ball.
1940, the writer Nicholson J. Hysmans coined the word "expectant mother" in his book. As time goes on, this idiom has different meanings. This idiom means "postpartum depression, postpartum depression" today.
Example:
According to many studies, even new fathers may face? Light blue.
According to many studies, even new fathers may face postpartum depression.
According to this article, as many as 60% of women have it. Light blue.
This article shows that up to 60% of women have postpartum depression.