AmandasmomAmanda, who is now 20, received only a split flu shot the first time she got it, which was probably aboaut the age of 8. After that her pediatrician said that she could get the full dose in one shot.
If your son did not have a bad reaction to the vaccination, I would not worry. Our kids do not have compromised immune systems, and he is now fully immunized.
Amandasmom