nope; its no myth; but it does level off here and there. i found that i lost the most weight in the first 6 months, then again around like 9 months, and 12 months, and 18 months. my son self weaned at 20 months. the more he nursed during certain times, the more i lost. so when he was nursing really often to increase supply (during growth spurts) i lost more.
however, im going to warn you, it took 9 months to put that weight on, and 50lbs is a lot of weight. (not that theres anything wrong with that, im just trying to get the pressure off here..).
i gained about 50 lbs, but 144 was about what i weighed before.
you are going to have to know its going to take more than 9 months to get this weight off. and its likely its going to take some hard work, some cardio, working out, walking, using a smaller plate to decrease portions, but all of these things are things that you dont want to do while you are breastfeeding. you want to do things slowly so that you dont unintentionally decrease your milk supply. so just take it easy on yourself. this is normal for moms. there are a lot of thigns going around lately about "real mom bodies" where real moms have pictures of their bellies or bodies after they've had kids. every single mom is going to have some sort of jigglyness, some sort of stretched skin, some sort of stretch marks, something. im absolutly convinced that anyone who looks anything other than a mom after having kids has either had surgery to look that good, or has major makeup work on it or flat out has had computerized adjustments to their photos.
so just relax. talk to your doctor, look online for real mom bodies. we all have jiggly stomachs. yes we are going to look different. stop thinking about what your partner is thinking. if he really loves you he isnt caring at all about what you look like! !! real love, real, comitted love, doesnt see stretch marks and jiggly bellies. if thats what your partner is focused on, then they have the problem.
anyway. thank you for breastfeeding. yes, it will help you drop some weight, but no its not a cure for a jiggly belly. take it easy on yourself. start making really healthy food choices. dont buy anything that qualifies as junk food, if you dnot have it in the house, you wont eat it. eat in more often than eating out. focus on your baby, and doing what you need to do. im here to tell you that as depressing as it is to have that belly, its even more depressing to think about your life without your baby. ;):) its worth it.