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Discover LudwigThe phrase "fourth trimester" is correct and usable in written English.
It can be used to refer to the period of time after childbirth, typically encompassing the first three months of a newborn's life.
Example: "During the fourth trimester, new parents often face challenges as they adjust to life with their newborn."
Alternatives: "postpartum period" or "newborn phase".
Exact(17)
This week had a treat in store - a Mama Mio fourth trimester massage.
Fourth trimester: patient fitted with special clothing and encouraged to mingle in society.
"In some ways, the fourth trimester is the worst trimester because it's so open ended," Ms. Lange said.
The first three months of Baby's life, he said, were known as the "fourth trimester" when the infant was out but wanted to be in.
"They call that first three months after birth the fourth trimester and that's the biggest change for mum and the baby – it is really a critical period," she says.
A new expensive drug is not enough; we need humane, evidence-based maternity care, respect for the "fourth trimester," months if not years of paid parental leave, and affordable child care.
Similar(43)
First trimester?
In the first trimester.
Second trimester: also no change.
End of the second trimester".
She had just entered her third trimester.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com