A fever of 102.5 F in a two-month-old baby requires immediate medical evaluation. In infants under three months of age, any fever of 100.4 F (38 C) or higher is considered a medical priority. Please contact your pediatrician or visit the nearest emergency room right away. Do not give any over-the-counter fever-reducing medications, such as acetaminophen, before your baby is examined by a doctor, as this can mask critical symptoms. In the meantime, keep your baby comfortable in lightweight clothing and continue regular feedings. Your pediatrician will calculate and provide the exact, safe dosage of acetaminophen based on your baby's weight after the evaluation.