The more I think about it I reckon you have to change banks.
Our bank has never asked us about kids. In fact the last time I dropped into the bank with the wife was the first time anyone has asked us in my entire lending history......and that was more of a "how do you do?" than anything probing.......
I get that in theory with kids now you have less cash to service a loan but the banks actuaries should have factored that in on day one when assessing the original finance......a young couple+home loan = kids generally at some point......