The Collaborative International Dictionary
Monthly nurse
Monthly \Month"ly\, a.
Continued a month, or a performed in a month; as, the monthly revolution of the moon.
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Done, happening, payable, published, etc., once a month, or every month; as, a monthly visit; monthly charges; a monthly installment; a monthly magazine.
Monthly nurse, a nurse who serves for a month or some short time, esp. one which attends women after childbirth.
Wikipedia
Monthly nurse
A Monthly Nurse was a woman who, in 18th and 19th century England, looked after a mother, and her baby also, for the first few weeks after birth.