My son had vaccines in each leg yesterday and can't walk today. He's in a lot of pain. Is this normal? What is the best remedy: ice tylenol (acetaminophen) ibuprofen

Common side effect.. Local reaction at the injection site occurs in about 20% of patients. Usually this goes away in 1-2 days. Things to try: (1) cold pack - for initial pain or tenderness at the injection site, apply a cold pack or ice in a wet washcloth to the area for 20 minutes each hour as needed. (2) pain medicine - give Acetaminophen (e.g., tylenol) or Ibuprofen by mouth. Do not give aspirin.