Is it normal for mostly breastfed/partially formula fed babies to look like they lost weight at 2 months?

My 10 week old looks weaker then she was a few weeks ago, she was gaining weight fast and was really round and chubby but now she looks like she lost weight? Someone told me that she didn’t lose weight, it’s just that she got taller, which is true because she does look like her height went up but stil wanted to make sure .

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