Parent can only try their best and just to make sure to give birth to what they are capable of raising well.
There is no easy path for a parent and there is a lot of failure. However, trying your best also includes improving yourself. It isn't all sacrifice for the child, it is growth for the family.
Another thing people say is that if you don't give birth to two to three children, what if something happens to your only child.
Yep. And this is far, far more the case in your area than in Finland for instance. Here, one is the norm - two is considered a larger family. Strange hey? I come from a family of five kids.