Shot reactions: Shot reactions are very common. Dtap contains tetanus. If u have ever had a tetanus shot they hurt like anything for 2-4 days after the shot. Fever and headache is also a common side effect as his immune system is responding appropriately to the vaccinations. I would have the pediatrician just look at his leg to make sure that a cellulitis (skin infection) is not happening.
Answered 11/26/2013
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