No, you should not wait. The sooner your child starts services the better. You should not wait when it comes to your child's mental health and development. Children who begin ABA therapy at a young age (18 months - 6 years old), while still in the traditional “brain development” stage, will have a higher likelihood of achieving full developmental capability, as opposed to children who start therapy at a much later age. The research is incredibly clear: the younger the child and the more hours of therapy the child receives, the better the clinical outcome.