I have to disagree with this. Maggie, my first adoptee, had some VF form of post-natal depression. The compulsory two years of carrying the baby (to date, she gave birth thrice) makes her 'a little blue' or 'depressed' all the time.
Maggie would end up sleeping the day away while her poor husband, Caleb, singlehandedly did the housework, interacting with the other children while trying to raise his career progress.

Of course it differs from family to family. But I don't find any gender inequality except for the carrying the baby for two years idea. That is ridiculous.