Mortgage with baby on board!

I had a search but couldn't find any threads on it.

I'm hoping to go for a mortgage either at the end of this year or the start of next year. We are expecting our first child in September, very pleased and excited but would anyone be able to give me an idea of what difference that will make on what I can borrow?

I have a few things to pay off before I go speaking to a mortgage broker and just wanted an idea in the meantime :money: