My 1 year old developed slight fever after a vaccination. Should I just give her some crocin and see how she is?

no i think you should definitely give the doc a call and check. even if your baby's doc recommends you give crocin, it is always important to first check with the doctor about it. sometimes, there may be some added symptoms that your doc will check before prescribing a medicine. so i would say always ask and then administer any medicine, even if it is an over the counter one.