no harm but he will still need a polio booster between the ages of 4-6.
if a child has had polio vaccine at 2mths 4mths and 6mths would getting ipv at 18 mths harm the child? . the child also recieved ditheria and pertusis shots at the same time. are there any side effects from getiing the 4th shot prior to her 4th birthday?