I can't keep weight on while breastfeeding. I was 92lbs before birth (I'm only 5 feet) and now I'm down to 79. I have had my thyroid checked and it's fine. I'm very worried and am trying to eat more. I hate how I look - clothes don't look good and i have no curves. Has this happened to anyone else? Any tips to put on healthy weight fast? The problem is that I have lost ALL of my muscle. Almost immediately after birth my Butt was completely flat and the day I left the hospital I had already dropped 20lbs. I only had 4 more to loose to be back to 92 and then I just kept loosing. I'm very depressed about this. I have a hard time finding time to cook.