That's Prolactin, the hormone that helps a woman produce milk. It makes it difficult for women to handle stress, gives them anxiety and depression at a higher rate than men and leaves them frantic so its difficult to focus on one thing at a time. It also tires them out more easily. Prolactin is highest when she is lactating or in the birthing process but it is present before and long after that window closes. It stays with them for the rest of their life. Yes, it's a good reason why women shouldn't be in the workplace, they are biologically unfit for it.
Past generations knew this and made concessions for women to make it easier for them but they were the ones that demanded we ignore it and expect them to work 40+ hours a week all their lives.
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