J.P.
I wouldn't doubt that at all! They are sponges.
I work with kids and I've touched a 13 year old's foot and he drew it up to his chest, like a reflex. I looked at the parent and said, "So, how much time did he spend in the NICU?" She looked at me shocked and asked how I knew. In the NICU, their foot gets grabbed and then poked with a a needle to extract blood for testing - constantly. NO one talks to babies like they are actual people.
Maybe learn how to do some EFT. My chiropractor clears emotional blocks within the body. My friend's son was SUPER angry all of the time and within 3 visits, there was a HUGE difference. Even after the first treatment, her son was different.
Maybe explain the sugery to him and tell him that might be where is fear is coming from. Ask him if any strangers have touched him.