I normally don't do the "I didn't read" thing, but I didn't read the stats and sources in your article (or your article) because in terms of all-cause mortality, the optimal number of children is empirically two: https://academic.oup.com/eurpub/article/21/6/732/495087

Given that, the entire medical danger thing is wrong. (See also https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5484032/, and chase references for protective effects.)

This isn't to say there aren't dangers, that people shouldn't be aware of them, that we shouldn't support people who decide not to have children, or anything like that.

It's only to say that overall the idea that having (a reasonable number of) children is a net threat to life or health is wrong. Yes, there are specific risks (e.g. perineal tearing is very rare outside of childbirth), and those may be important. But the situation should be phrased as such.

In terms of happiness, yes, childless people report higher rates of happiness throughout much of their lives--that's relevant and important to know. (Once children move out, the research is mixed, possibly because grown children are a source of social support and only a few countries have really good social support for older people.)