When there is fever
, it has some source I.e some infection. That needs to be found out and that can be done through physical examination. So you would better take your child to the doctor.
Till then you can give acetaminophen
syrup in case if fever. Give a tea spoon of lactulose
syrup two to three times per day for constipation
Hope it helps. You can get back to me for any query.
Best of luck for your baby and you too.