I have worked as a SEN nanny for about 3 years, for one year and a half I was one of the ABA therapists too. In the end the parents decided ABA was not a good option as it forces and restricts the child to "socially accepted behaviours", now I understand why and I agree. There are even adults with autism that stem when overwhelmed, I'm ADHD and have some ASD traits. Please please don't take my comment as mean, maybe you want to look into other Therapies too if you haven't yet. After reading and watching (on Netflix) "The Reason I jump", my perspective on ABA changed completely. Best of luck with your little one and I wish you all the best for the whole family!