Lots, most, perhaps, do. Also not to be confused with needing a break, time off, etc. We make a huge mistake denying that any differences at all between the sexes exist, because to the extent they do, denying them means those differences will not have been addressed, which means no allowances for them will have been made, which means the solutions based on flawed predicates ultimately will fail. If the situation that currently stymies many women because they have children from optimizing their lives is wrong for them, it won't be any more right to make primary parenting a deed that just gets equal-opportunity unjust desserts. Pregnancy is mostly irrelevant, because though it takes time and can be an impact, it goes away, and the childrearing is there for 18 years if not more and is way more labor and time intensive than the carrying was in most pregancies.
Birth is a process.
The baby may no longer be physically attached inside the woman, but remains attached for nurturing, emotional and psychological development. Not all mothers feel irresistably bonded, but many, probably most, do. I don't think I'm interested in working toward a world in which a strongly bonded parent, devoted to her children and prioritizing them, is considered pathological, underachieving or deserving of some booby prize. It is only over a period of years, about three, as the child becomes ambulatory and social, that it can be said that the child actually has disengaged to the extent that the attachment is similar in strength to both parents and perhaps others. The interruption will remain there, whether or not the woman works the bulk of these years, even full time.