I can speak on both sides of isle, too, for negative (the modern, western way) pregnancy & birth experiences, vs. very natural, positive ones... night & day. It's harder to ruin the force of things the younger a woman is, but I've known many a gal - even twenties - balk at more than one child due to neonatal, birth, or postnatal horrors. Conversely, an opposite experience makes you want many more.
Doulas & midwives are worth their weight in gold.
