My little boy loves giving a side eye if he's fuming with whatever you've said or done hahs x
Only if it’s accompanying other signs would I worry. So no eye contact, not responding to name, no waving/clapping/pointing being the main ones. And also stims, if he flaps or does a repetitive movement. My nephew is autistic and he does the side eye to look at things, almost everything got the side eye from him. So unless it’s like that it’s unlikely.
You Google anything these days and it’s autism! Is he showing other autistic traits? Have you spoke to an actual medical professional who’s qualified to make that diagnosis and not the internet? I’m sure it’s just part of his development and as they’re learning all these new things a lot of it is sensory seeking but that doesn’t equal autism! My advice? Don’t google!