Baby not thriving ?

My brothers baby is 5 months and only 11 pounds. He seems to not be looking around much or moving when held I held him for almost 3 Hours and no wiggles , crying or looking around. Correct me if I’m wrong but is there something wrong with this baby ? The mother smoked weed throughout the pregnancy. I think somethings not right ? But not sure what the diagnosis would be ? Ideas please.

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