Any discussion centered on GOD as the focal point then the answer should be coming from the Bible. Which is the word of GOD and not from the cognitive level of humans. From the Bible Children are a blessing from GOD. It did not say children born only from marriages are blessings. Although it is right for children to born into marriage so as to get proper tutorship from both parents. I believe every child is a blessing from GOD but training the child he right way is the responsibility on the parents.
If no blessing for children born from wedlock I don't think the world will be where it is now, because if everyone trace from where we are coming from, our fore fathers and mother can be a product from wedlock . How a child was born has nothing to do with child, children are innocent and very special to Good almighty. Children are blessing can always do well, children can only have problem growing up based on the kind of lifestyle of their parents