Good ways to lose weight?

I gain 40lbs on my birth control but had it removed a month ago. So what are good ways to lose weight with low energy and is possible to do with a toddler? Don't ask why my energy is low, i have no idea why. Doc don't care about it.

Please don't tell me itworks or diet things unless its like green tea, something natural. I already drink mostly tea vs pop. I read labels and pick things with no added sweeters/sugar and pick things high in fat over sugar. I don't do the shopping normally since my mom does it. Until I my own, I only have so much control what she gets since she don't care to read labels.