there are no studies of aripiprazole -- or any other psychiatric drugs for that matter -- in children under 10. that doesn't mean we never use medicines in children under 10 but it does mean that the prescribing doctor needs to be extremely thoughtful about what they think they are treating and be very clear to the parents in explaining possible risks versus benefits. small children have immature livers and so it is quite possible even a tiny dose of medicine will last longer than in an adolescent or adult. abilify itself has a very long half-life (2 weeks) so may hang around for many weeks after it is stopped in such a small child. presumably the doctor was using the smallest possible doses (eg 2 mg/day). stuttering is not a commonly known side effect in adults but could reflect effects of aripiprazoleon the ability to control tongue or mouth muscles. hopefully you are seeing an excellent child psychiatrist who knows what they are doing and who has experience is so unusual a use of a medicine like this and they should be able to guide you.
my 4 year old is on abilify. we upped his dose a couple weeks ago and he started stuttering. is this from the meds?