DS2 and I have made it to six months exclusively breastfeeding. I had visions of keeping it up until a year and then going straight to cows milk but I'm going stir crazy. He is still feeding at around 10pm which means I'm missing out on stuff (I'm missing a friend's wedding on Friday, and I was the only sober person at a hen night last weekend which wasn't that fun). He won't touch expressed milk out of a bottle (which is really annoying, as I've been able to express quite easily).
So my question is: can I give him the occasional bottle of formula (assuming he'll drink it) without buggering up my supply? I don't want it to become a regular event - I am exceptionally lazy and regretted weaning my first at nine months because even three bottles a day seemed like an immense hassle. But would every couple of weeks hurt?