dear user these symptoms you mentioned refer to having bacterial infection or viral infection of your grandson you need not to worry as the most common cause is viral infection and so we dont need to give him antibiotics only symptomatic treatment of antipyretics and give hime multiple fluids will help then improvement will occur gradually as the viral infection take about four days and symptoms will improve if symptoms persist or get worse we suggest that there is bacterial infection and antibiotic indicate now the doctor that examined the baby can give hime antibiotic such as amoxicillin by clinical examination we prefer to do blood test and nasopharyngeal swab for confirming diagnosis antibiotic is prescribed according to these tests just now you need not to worry if you feel gradual improvement of him and give him more fluids hope that helps you