Low fever
The Spanish term 'fiebre baja' is translated as 'low fever' in English. This term is commonly used in the medical field and it refers to a temporarily high body temperature, usually because of an illness. A low fever is a mild elevation of the body temperature, typically ranging between 99.5°F (37.5°C) and 100.3°F (38.5°C).
My daughter has had a low fever since yesterday.
In this example, the subject 'mi hija' (my daughter) is experiencing a state of low fever, indicated by 'tiene fiebre baja'. This has been occurring 'desde ayer' (since yesterday).
If you have a low fever, you should stay at home.
This sentence presents a condition 'si tienes fiebre baja' (if you have a low fever), followed by a recommendation 'deberías quedarte en casa' (you should stay home). The speaker is giving advice about what to do if someone has a low fever.
Low fever is one of the symptoms of the common cold.
This sentence identifies 'la fiebre baja' (low fever) as 'uno de los síntomas' (one of the symptoms) relating to 'el resfriado común' (the common cold). The speaker is listing symptoms commonly associated with a cold.