Lost my baby weight and then put a chunk back on.

I'm aiming to lose 19lbs as I'd love to buy myself some new clothes, but right now I don't really want to buy anything at my current weight. I managed to slim down to 8st 13 after having my little girl, but going back to work after maternity leave meant a load of bad habits creeping in. I have two family weddings and a holiday this summer that I hope to be looking good for.