Suggest Treatment For Kid Suffering From Fever And Ear Infection

Hello Im am writing to you about my 10 month old son..I brought him to the er yesterday evening cause he had a temp of 103.8 and they diagnosed him with an ear infection...they were able to give him medication and broke the fever...well this afternoon around 12 i checked his temp cause he was warm and it was 101.9 that was taken under the armpit,,,I just checked it again but in the butt and its 102.2...What should i do?