Between babies trim up!

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Hi my name is Shan! I had a baby in January. A beautiful 10lb. boy! After, I craved sweets worse than when pregnant! So I gained even though breast feeding was shedding pounds! In January I will have breast fed a year. The doctor says we should try again for a baby asap. (I'm 36 and want three children before 40.) So I need to get in shape asap both for my overall health and to not be over 200lbs while pregnant! Anyone else in a similar position?