Dear parent,
Mild pain , swelling at vaccination site and mild fever is expected with few vaccines.usually it will subside by 48 hrs.continue giving paracetamol for 2 days every 6th hrly.check whether u are giving correct dose according to his weight.
U can apply ice pack wrapped in a cloth over injection site intermittently..
Next Steps
consult doctor if there is high fever, excessive crying or irritablility.