How do I gain weight healthily?

immjusttmee
Im underweight and pretty short, so obviously i look younger than my age. I've noticed other short girls around my height look older because their bigger in terms of weight. I want to gain more weight, but at the same time since im short, i dont want to look fat. Is there a specific type of food or something i need to do to gain more weight wihout looking fat? The thing with me is that i get full very easily and im worried that will make it impossible for me to gain some weight. I just want to be healthier because it will not only change how people see me, but ill also feel emotionally stronger. Any tips on gaining weight?
How do I gain weight healthily?
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