When applying for our mortgage last year we were 6/7 months pregnant with our first child so we obviously disclosed same when addressing that question. They deduct X amount from your net income for each dependent child when determining your repayment capacity. Can't recall exactly what X is, may have been in the region of 800/900 euro. Probably varies from bank to bank. Technically if your not pregnant then I would imagine for that particular scenario the answer is no. Obviously it would be prudent to factor this in for yourselves when looking at repayment amounts.
P.S. Amount deducted for a dependent child in our case may have been based on our particular set of circumstances. It may vary with where you live, i.e. childcare costs, if both parents are working, etc.