Lexi weighed 3lbs on the nose at 14 wks, she is now 18 wks and still only weighs 3lbs(not an ounce more). She is getting bigger but not gaining weight. I called my vet and she said that is normal she is just losing some of her baby fat and as long as she is growing and not actually losing wight she is fine. I trust my vet but wanted to get your opions, is this normal?