Teen pregnancies are normal and natural from mid-late teens, as long as they are physically fully mature.
It’s society that makes (post-puberty) teen pregnancies difficult, not biology.
It’s not normal or natural that motherhood should be life-ruining and cripplingly expensive.
Uh, no they're not.
In nature, especially among the mammal variety, first time mothers almost
always lose their first couple of offspring due to a lack of experience with raising them. This is why most male animals of the same species will always be more drawn towards females with offspring; they're naturally more inclined to find the mothers best suited to continue their genes.
Young motherhood is associated with higher levels of infanticide, parental neglect and abandonment in nature. An inexperienced mother bear will, for example, often accidentally kill her own cubs in the den.
Lets not even get started on the mammals with far higher intellect. Orcas will typically not become mothers until their early twenties, and only having calves younger if their population has been significantly depleted. And even then, their calves still have a high mortality rate. Elephants will not usually breed until well into adulthood, and spend early adulthood helping older females raise calves. Wolves and coyotes also spend similar early adulthood helping out their mothers with cubs.
I could list many, many more examples which immediately makes your point moot just from nature itself. If all of humanity were to return to living in archaic hunter-gatherer societies, teen pregnancies would still be rare because surviving into adulthood is the name of the game, Moids died a lot younger than women back then from engaging in tribal warfare or hunting accidents.
Teenage pregnancies did happen once in a while, but it came it fatal results. Why is that, you may ask? The vast majority of skeletal remains of archaic infants were often found with 13-19 year old girls. The suspected mothers in question had injuries that were consistent with birth complications (such as a too narrow of a birth canal, infant’s head being too big to be delivered, etc). Due to archeological evidence, its safe to assume that getting pregnant that young back then was a death sentence.
Its safe to assume that archaic humans also figured out that young pregnancies weren't good for survival. A good portion of skeletal remains of women were in their 40s to 60s at death, after all compared to the average moid rarely reaching their 40s.
In other words, just because you can technically do something it doesn't mean you should.
Another thing worth noting is that over a hundred years ago, most girls didn't start menstruation until they were 16-19 years old. Interesting how that works.
Pedophiles often misrepresent nature and biology to justify their fetishes for minors, because most people don't know jack shit about either nature or history. Nor do they care, they just want to convince everyone around them that their attraction to minors is normal.
