The user's 10-month-old baby has small bumps all over their body after having a fever for three days. It is difficult to determine the cause without seeing the lesions in person, but it is recommended to consult a doctor to receive a proper diagnosis. If the fever returns, the bumps worsen, or the child becomes lethargic, it is best to see a doctor immediately. If the bumps are still present after five days, consulting a doctor is also advised.