At one point, children were an asset. They are now a massive liability, by my estimation, though I admit that my viewpoint is heavily skewed.
When Vikings were sailing around generally fucking shit up, it was considered a good thing to come back from a months long voyage to find your wife pregnant by another man. He got to sleep with your wife, but you got to keep the baby. One more hand to work the farm, one more son to carry a sword, one more daughter to marry off and solidify inter-clan loyalties and alliances.
Now, be prepared to spend buxxx