What is a normal reaction to shots in a 4 yr old?

Depends: It depends. Some children have no problems with shots . Other children are very fearful and cry and sometimes even need to be restrained during the administration of the shot.

Depends on variables: I find that the kids who knew they were coming do better than those the parents didn't tell.. If you think they will throw a fit, they will throw a dozy when you hide this from them.They can whine & fuss before they come & the shots end the process. Most do well & have a bit of pain for a day or so but no significant side effects.