Yes,they should do that for maternity reasons, being a mother is a full time job from my point of view,specially in the first years of upbringing children.If they don't have kids or the kids grew up a little ,they can pursue a job,but they have to keep balance then.
It is not easy to multitask without neglecting the one responsibility or the other.
It is a pity if a mother neglects her responsibility towards her kids,because no one else can do it better than her.
Pursuing a career might be very important for some women and they should go for it, but the tasks of those jobs shouldn't then have a negative impact on their roles as wives and mothers,otherwise they better choose to stay single and dedicate their lives for a prosperous career, that is an option as well. They could alternatively have a plan of being full time mothers for several years,until the kids go to school, then start to pursue a career.
Practically it is very difficult to do both jobs efficiently,unless the job is minor and doesn't require that much effort and time,but if the woman could manage both and keeps a good balance, that would be the optimum choice then.