OK, briefly:
Say your current mortgage was based on your pre-children income. Say you're planning to move somewhere bigger (but in a different, cheaper area) and sell your current home. Obviously your income's significantly reduced because one of you is doing childcare but you are confident you could still afford the repayments, especially given once moved I would be looking for PT work. Will we get a mortgage?
I ask because based on DP's income alone we won't be able to borrow enough to afford the new place.