I'd make it mandatory to use it, in the interest of the child, but that's just a personal opinion. Also, if it's not mandatory, the old-fashioned employer (who still exists) won't hire the female because of the by old fashionedness inspired idea that the woman will use it and the man not.
If it's mandatory, you'll also avoid situations where a childish employer will abuse his power by putting his employees under pressure not to take it, but that's a different topic.
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