I think he's fine. Remember he's 9 months so he's in that growing stage. Rocco was even a bit thinner at that age and I was worried until someone explained it like this: think of a 15 year old boy. Usually, if they are healthy and fit, they are going to look a bit skinny or lanky. But, they will fill out as they develop. I think your boy is perfect for 9 months.
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