 [ Symptoms ] 2 yr old that is running low grade fever 101 4 drinks a small amount of liquids and fills 2 diapers peeing  sleepy throws up will not eat [ Disease ] hi yes it can be an infected lymph node and for confirmation consult a physician and get a clinical examination done if there is any doubt ultrasound will be advised as of now do cool compresses over it and take anti inflammatory painkillers like ibuprofen hope this helps