People over-reproducing is a strain on society. I'm not saying we should limit how many children folks can have, but there isn't any societal upside to 14 person families.
A robust sex ed curriculum, free contraceptives for everyone NQA, free abortions up to delivery. Fund social services adequately. One party is dying on the hill in an attempt to prevent these rational evidence based measures. I'd rather believe that gullible religious types are tricked into hating these things because it helps the capital class maintain a large uneducated and impoverished workforce. I realize that this may be wholly wrong.
On the other side of things..
If the birth rate declines too fast then entire generations will be raised to keep their ancestors alive, instead of doing other things like mining asteroids or creating new AI to better sell Facebook's new facehugger 3000 vr facemask with built in respirator.