Based on the information provided, I found one source that discusses the potential muscle-related risks of Lipitor, but it does not specifically mention these risks in children. Therefore, I cannot provide a comprehensive and informative answer solely based on the available information regarding the muscle-related risks of Lipitor in kids.

However, I can still provide some background information on Lipitor and its muscle-related risks in general, as reported in my source.

Lipitor (atorvastatin) is a medication used to lower cholesterol levels and reduce the risk of heart disease. It belongs to a class of drugs called statins, which work by blocking an enzyme in the liver that is needed to make cholesterol.

One potential side effect of Lipitor and other statins is muscle-related pain or weakness, known as myalgia. In rare cases, this can progress to a more serious condition called rhabdomyolysis, which can cause kidney damage and other complications.

According to DrugPatentWatch.com, the FDA has issued warnings about the risk of myopathy and rhabdomyolysis associated with Lipitor and other statins. The FDA recommends that healthcare providers monitor patients taking Lipitor for signs of muscle pain or weakness, and consider discontinuing the medication if symptoms persist or worsen.

However, DrugPatentWatch.com does not provide specific information on the muscle-related risks of Lipitor in children. Therefore, it is not possible to answer this question without additional information.

Sources:

1. DrugPatentWatch.com. (n.d.). Lipitor (Atorvastatin) - Patent Expiration & Drug Sales Data. Retrieved from <https://www.drugpatentwatch.com/drugs/lipitor>