The correct answer to this open question is the following.
As it happens in most cases, this issue has advantages and disadvantages. But the thing is that under the present economic, political, and social conditions, smaller families have better chances to offer the support to raise children and give them education, shelter, proper nutrition, and better chances to thrive.
In the past, natality control was not an issue. Parents could have two, three, and more children. The economic conditions were completely different from the ones we are living in today.
Education has played a major role in creating consciousness in new generations about having a small family or not at all. Young couples have different priorities such as personal development, scale-up in the corporate world, travel, and other different options.