Formula feeding just once a month swish?

Liz

My 12 week old baby has been breast fed her entire life. I managed to pump 3oz when she was 2 weeks old after hours of pumping and then she took it from a bottle with her grandma. My pumping is EVEN worse now. I could pump all day and get 2oz. I want to go out now and my mum is desperate to babysit. I am happy to do this but would have to leave formula. She will hopefully have a bottle of formula maybe once a month and breast feed all the time until May when I return to work.

I'm happy to do this but what about my cloth nappies? Do I then have to swish every nappy or how long before it becomes just breast milk poo again?