How can I make my baby get fatter?

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One time, my uncle saw me and my baby and asked why I was the only one getting fatter. Then it occured to me, he's right. I was the only one getting fatter. We've tried all the formulas and vitamins the doctor advised. But there was no change. Though she's not malnourished nor underweight. I'm not yet satisfied with her body built. I would appreciate it if you gove me advise how I can do to make her fatter. Thanks!