Visible elements of pronatalism are largely focused on assigning a particular family role to women and trying to increase the supply of a particular kind of desirable baby (often white, but sometimes focused on IQ selection and other eugenic elements).
The eugenics part doesn't match my experience at all. I've never seen any evidence that people who are having large families are motivated by that.
Every younger sibling from a large family that I know was in large part raised by their older siblings.
Then don't because it's just wrong. Very few, if any, of the "more babies, bigger families" types have any interest in or concern for the children after they're born. In fact they're usually the ones fighting tooth and nail to prevent any kinds of programs or services that might help the resulting children and families.
For them it's just a pure numbers game/bizarre sexual fetish disguised as a philosophy.