The early start denver model, a comprehensive developmental behavioral intervention, begun at <30 mos.
& continued for 2 yrs., shows improvement in iq
, adaptive behavior & degree of autism
. Early aba 25-40 hrs./wk can make great improvements in hfa & good improvement in kids with intellectual disability. Some of my patients who just tantrumed at 2-3 yrs. Are now in college & grad school.