Natalism is a net benefit, but it should be tempered with healthy breeding as well. Most women these days are under the delusion of freezing their eggs to get pregnant later among other fallacies ultimately detrimental to human health and growth. Every single young woman should understand the concept of a geriatric pregnancy and know the risks of what causes down syndrome to begin with.
It seems like natalism is encouraged by multiple worldviews. For the Capitalist, he needs workers and cares not for the individual struggles a million more mouths would demand and the pain and suffering endured by a majority of them for the sake of his pocketbook. For the Nationalist, he wants more of his people because of the inherent struggle in nature between the various races of man for resources and ultimately life and death. The communist leverages certain types of natalism, that being more births of people who can be easily controlled and less births of those who cannot be controlled. The Christian worldview, especially the Catholic one, crosses over more with the Nationalist point, for in the position of moral obligations to our mandate from God to be the curators of His work we must have progeny and educate them in His laws to keep the balance in this world. Yes there is love in there too, but that comes from understanding the Lord's work.
Yes it should be encouraged, but people must be made aware of the ulterior reasons why certain people push for it over other more natural reasons in line with God and nature. Dysgenics must be discussed and people need to be informed of what the facts are. It is a sensitive topic for some. For as much as it is cruel to look at downie's from a capitalist lens as being worthless (which they are from that point of view) it is conversely better to root out the causes of genetic deficiencies and have people breed more but with a spiritual purpose to it. Women who are over the age of breeding should not be trying to get pregnant and pushing one laborious gestation into the world that will most likely be a life full of misery for that soul who is born. I know a few people in extended social circles who were born to mothers over 40, and while it is not a cardinal rule, all three of them have physical deformities.
This does not make them any less of a human to me personally, but the effects of birth are not just random chance, sometimes there are no reasons why a woman in her 20s has a stillborn and a woman in her 40s does not, but going off of all the data we know from the entirety of human history, women and men should pair bond in their youth and begin families then. Older men taking younger wives will always work it is just a bit socially awkward after the terminal phase of feminism has inebriated the minds of girls everywhere.
. I’m referring to the utilitarian use giving birth to children for the purpose of economic and social means. I agree, the act of procreation itself is inherently good, due to it being through God’s design. 
