If my child is sick, should I put off vaccinations?

No. Mild illnesses, like a cold, have no effect on vaccines--side effects or effectiveness. Your doctor might delay for a high fever of 103 or 104 since vaccines can cause a fever. In general, infants and young children catch so many colds and ear infections their 1st few winters, they might get way behind in vaccines if we delay with each minor illness, placing them at risk for serious illness.
No. The only medical reasons for postponing your child's scheduled vaccinations, are a fever over 101 (add a degree if you take it under the armpit), the flu or a serious illness. Otherwise, a runny nose, cough, or even diarrhea is not a reason to put off protecting your child.