My son has always had great eye contact, but he does have a flat affect as well. He can smile when he's happy and make a sad face when he's crying, but he can't do angry, disgusted, surprised, worried, etc. He literally cannot move certain parts of his face, like his eyebrows.
He was also very undersensitive to touch when he was a baby. Nothing bothered him, he couldn't feel pain in his legs, never complained about any kind of touch or anything. He was always climbing onto my lap, loved constant hugs, his arms are like two wet noodles when you wiggle them. After 1 year of occupational therapy, he started to be the opposite and complain about pants and blankets hurting his legs, but that didn't start til he was almost 4 and he still doesn't seem sensitive in the top half of his body. He also still has extremely low tone in his face, arms, hands, and upper torso.