Leaving work early and financial assistance.

I'm after a bit of advice about extra financial assistance on top of the paid parental leave. I will have to leave work fairly early in my pregnancy as I'm a plumber, and I imagine crawling around stomach first, working at the top of ladders, and heavy lifting aren't ideal for the child! We aren't too poor currently, but I don't see how we would be able to live off just one income for such a long period. It is unlikely that I could do light duties as I work for a small business and there really wouldn't be enough "light" work available to justify me being there. Any up to date information or links would be great. Thanks.