Does anyone know, the toughest work a woman has?

After graduation, i tried finding a job, it was tough yet manageable.
While working, it had to show performance, fine, it is not a big problem

After wedding, to take up responsibilities, was a challenge too
To work and to be a wife was challenging as well
Pregnancy was very challenging
Delivery to the Number 1

But to feed the kids from milk to semi solids, my God... Unexplainable...