We started our daughter on her immunizations after her medication had stabilized at around 4 months old.  We were about a month behind what her scheduled immunizations were for but we pushed the last couple a little closer together so that we could get her caught up for her age. 

We also gave our daughter Tylenol about an hour before we went for her shots.  She never had a problem, this last time (for her 6 mo.) she ran a little fever (99.3) for about a day after, but we’re not sure if that was due to the shots or to the fact that her top teeth are pushing through!