There are several possible conditions for a baby to have a lower platelet count with fever: firstly it may be due to an infection, because whether it is an infection with bacteria or a virus, it can cause a lower platelet count. Secondly the side effects of some medications, for some medications can also lower the platelet count, these are the things that need to be taken care of. Secondly, for some immune system disorders, regular observation is also required. If the decrease is persistent, accompanied by bleeding at this time, it must be noted that it may be a hematological disorder, which should be detected and treated as soon as possible. If the infection is due to a virus or bacteria, the condition will disappear after the foreign body is removed from the body.