For one thing "having" children is a bit misleading of a phrase -- it isn't like "having" dinner out or a trip to Europe. It is not without extensive Having in its own right, though; but you don't select it the way you choose aplanned career or a house on the market.As to readiness, peak in the bassinet. if someone's in there, you're ready. You may not know it but like birth itself, there isn't any other way through it. And ready is as ready must do.
Regards,
Amos