My son had his 2month shots today now he really fussy and won't eat why won't he eat ?

Many infants become : fussy, tired & not interested in feeding for 2-3 days after receiving vaccines. Ask his doctor about using Pedialyte to keep him well hydrated, with his usual number of wet diapers, & Tylenol (acetaminophen) for pain or fever. Take him to his doctor if he continues to be off his feed or have fever, a rectal temperature of 100.4 degrees or >, for more than 3 days. Immunizations are important protection for him.