Hi don't worry about the weight part if the baby is active and achieving milestones. You can include good fats like ghee, coconut oil ,unsalted butter, potatoes, Paneer, avocado etc in his diet regularly. Dont force if the baby doesn't want drink animal milk. Give family food and encourage self feeding.

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Yes you can give external milk... Give in the form of milkshakes.. banana milkshake mangoes milkshakes...you can give chicken soup and eggs too..