In communities like the one described it's not uncommon for children to be an economic asset — yes, it's a cost for the first few years of their life, but once they are able to help tending animals and fields they can produce sufficient food to sell that they cover their living expenses.
What you are saying is akin to slavery, and it's wrong. Children shouldn't be conceived with an eye toward making them work on the family farm, and they certainly shouldn't be forced into manual labor.
