I often find myself doing two or three things at the same time, none of them well. If I have to do this for an extended length of time I feel increasingly unfocused and frazzled. Surely most people are the same. However in day to day life what women do can always be interrupted - by everyone from school ringing up with some bullshit about regulation shoes or forgotten planners to an ex partner wanting to be instructed on how to organise his Xmas leave.
There is an old trope about one's creative life ending with the pram in the hallway. IME the six/nine/twelve month break involved in that isn't the end of anything - it's more that once the pram is there a woman never again has an uninterrupted thought.