If you look up the conditions for the granting of a declaration of nullity, you'll find that the conditions are similarly reasonable. The conditions include the intention to remain married (not the intention to bail if the marriage becomes inconvenient) and being open to having children. Both of these conditions are understandable. It's also understandable that the intentions of many couples in our selfish age do not meet these conditions.
I can see refusal to have children as a more reasonable cause for annulment than the excuse that a baby was on the way when the wedding happened. I knew a couple where the husband got a vasectomy without the wife's knowledge after they had several kids --- she was angry and hurt but they didn't divorce.