hi there! my boy is 8 months now and he has gone for an injection every month since. yes, there are a lot of injections baby has to go through (apparently it seems necessary for them to go into P1). depending on your baby's body reaction to the injection, he may or may not have a fever. my boy thankfully did not have soaring high fevers after his jabs, his temperatures were usually slightly higher than normal baby temperature.
if my memory does not fail me, the jabs that gave him slight fever were the pneumococcal and the 5in1. you can ask your pediatrician more about these jabs and what infections they fight against. the other jabs like Hep B or even the rotavirus (given orally, but optional) did not cause much problems.
in any case, if baby gets a fever - dont't panic. remind yourself that it's just baby's way of combating the jab and it's perfectly normal
hope this has helped!