The Bible did say be fruitful and multiply but it also says that we should be good stewards of our resources.
And the bible actually makes specific point of parents not to stretch their means as so they can provide for the children they already have. Which is why I fully don't understand these random nutjob families around the country that say it's the will of god to have as many kids as humanly possible.
http://news.bbc.co.uk/2/hi/asia-pacific/8469532.stm South Korean government workers are being given an unusual instruction - go home and multiply. At 1900 on Wednesday, officials at the Ministry of Health will turn off all the lights in the building. They want to encourage staff to go home to their families and, well, make bigger ones. They plan to repeat the experiment every month. The country has one of the world's lowest birth rates, lower even than neighbouring Japan.
I fail to see how parents can have a quality relationship with their kids when they have a bunch of 'em. I just think the whole quiverfull concept is just a lame way of keeping women down.
It seems like with a lot of really big families they just make the older kids raise the younger ones. So the parents don't even interact that much with the youngest and the oldest are forced to be parents at a very young age.