Re: Do you need to give cow's milk?
Boy, your GP gave you some bad advice! Cutting a reliable source of complete nutrition (i.e. breastmilk) from your child's diet is not a guarantee that they will increase their consumption of other foodstuffs enough to increase their weight gain. As long as you are still nursing 3-5 times a day, you are meeting your child's needs for dairy and there's no reason to introduce animal milk unless you want to do so. Human milk actually contains more calories and fat per oz than cow's milk (see this reference: http://www.kellymom.com/nutrition/mi...kcalories.html).
That being said, if you have a very small, skinny toddler, you can definitely try giving her some cow's milk at daycare instead of water, and you can feel free to concentrate on offering her calorie-rich solids like avocado, whole milk yogurt, cheese, meat, and beans, and add a drizzle of olive oil to her low-calorie veggies.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"