The duration of viral fever in one-and-a-half year old babies cannot be generalized, some babies have fast recovery time and may get well in 3 to 7 days, while some may take longer to get relief. The duration of a baby’s viral fever is also affected by the severity of the illness, the type of virus that infects the baby, the baby’s own physical condition, and whether or not the baby is treated. For milder illnesses, babies with good health and symptomatic and etiologic treatments tend to get better faster, and may recover in 3 to 7 days. Babies with more serious illnesses, poorer health, and no treatment tend to have longer duration, which may last for several days or more. When the baby has a fever, attention should be drawn to the hospital in a timely manner, to clarify the cause of the disease and follow the doctor’s instructions for treatment, so as to avoid delays in the condition.