When can my baby take a pain reliever without a call to the doctor first?

It will be better to consult doctor first as the dosage will be different based on the age, weight and medicine concentration. If you are using pain reliever for baby's teething, you can try other alternatives first, e.g. teething gel, cold teether, teething necklace, gum massage and etc. If you are using paracetamol for fever, you can bring your baby to PD's clinic to get the latest dosage based on baby's weight without doctor consultation. If fever lasts for 72 hours, you should bring baby to PD for a detailed check, e.g. urine test/blood test to rule out any infection.