help loosing weight after baby

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Hi, mother of one, expecting another in 17 days! I gained a lot of weight with my first pregnancy in 2014 and sadly didnt loose any of it. I knew we were going to try for another baby in a couple years and I didnt want all my hard work gone with another pregnancy. But now we are done, after this baby is born we will have our 2 :) I have had weight problems since puberty hit me at age 12 its just been back and forth since then never really being and looking the way I wanted to. So this year, this summer, I want to look and feel healthy. Tips and reccomendations would be wonderful. (I plan on breastfeeding, so weightloss would have to be all natural no supplements)