Yesterday at the CLSC, we discovered that my 5-year-old son had received 2 doses of vaccines too many (pneu-c and another). Is this serious?

It is important to consult with a healthcare professional about potential mistakes in vaccination doses, especially for young children. Contacting the clinic where the vaccines were administered and providing information about the specific vaccines received can help clarify any concerns. It is always better to be cautious and seek clarification from a medical professional in these situations.