Aspergers Children and Sibling Aggression

"My son is an 8 yr old fraternal twin. He was diagnosed with ADHD and generalized anxiety disorder in the summer of 2016 and was diagnosed with autism (high functioning) in the summer of 2018. He is the oldest of 5 boys ranging from 8 to 14 months. My question is: How do I keep him from physically attacking the baby when he gets frustrated? This has only been happening physically since September of last year, but verbally has always said he hates the baby, wants the baby to die, etc. since he was born. I know it has to do with him feeling he's not getting the attention he wants, but with 5 kids, the youngest being of an age that is very demanding, I don't always get to focus on the 8-yrear-old as much as he would like."

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