HELP! Can't seem to get back on the weight loss band wagon

I am in despite need of advice on how can I start back losing weight after my baby.  She is 9 months old. I have just starting back being a to get around 6 hours of sleep and function with being exhausted.   I only gained 10 pounds while I was preggo, but since having her I have gained a additional 15 pounds!   what can I do to start the weight loss again.