Those reproductive activities can be viewed across the near entirety of the animal kingdom.
And the societal "value dissociation" of child-rearing is not a product of capitalism. Across large communities, the value of child rearing is mostly realized within the context of a family unit. That just means that to entities outside of the family unit, the caring for the child has very little value. That's not to say that the general wellbeing of children across the society has no collective value to those within, which is why most people support access to education, child protective services, and things of this nature. Within a family unit, however, the person handling the child-rearing is of substantial value.
Your claim seems to be that:
1.) capitalism results in the dissociation of value for reproductive activities
2.) capitalism results in these activities primarily being carried out by women
3.) therefore, capitalism is responsible for assigning women a role and simultaneously undervaluing it
If this is not your claim, and please note that it is extremely difficult to actually discern a logical position from the text provided, please feel free to clarify.
If that IS your claim, then I would suggest that my counter is that:
1.) Capitalism only undervalues child-rearing if you fail to understand that the objectives of capitalism are predicated on the individual objectives of the entities within. The reproductive interest of a particular entity tends to be disproportionately valuable to that entity and their partner, much more than a third party. To say that capitalism undervalues that objective is simply contingent on the context.
2.) Capitalism "results" in these activities primarily being carried out by women only insofar as capitalism is a system in which individuals can act according to their own objectives. Many women do not want to reproduce at all. Many women do not want to be with men at all. This is completely fine, and never-married women with no children tend to be highly successful in other dimensions. Many women, however, do want to reproduce, and the fact that women and men tend to diverge in their roles regarding child rearing is not simply something that can simply be asserted as being a consequence of capitalism. Our capitalist systems are not collapsing under the increasing likelihood for a woman to be partnered with someone is less educated and makes less money.