While what you see in the infographic is indeed the early signs of autism but still can’t be generalized, they are indeed good indicators though.
I have shared my experience on the discovery with my child, a lot of it is true and few not so relevant. Each individual is different, so is the discovery process and our action.
Prefers to play alone: This is true, he always had and still plays alone, and I don’t think it’s his preference, but he doesn’t yet to how to play with others. If we sit together and play a game, he will but gets bored quickly and wants to get into his world.
Avoids eye-contact: This is completely true; my son does not have any eye contact at all with anyone, even in a situation of need, and it’s true with establishing eye contact with us as well. You have to force him to look at yourself and when he looks, that moment is the world for us.
Is not comforted by others during distress: Not applicable with my son, when in distress or sad, he needs us, he wants that warm hug. He will call out the words he wants to hear from his mother. If he is hurt, he would need attention. if others here is stranger, that might be true, he is not exposed too much with the world independently right now.
Does not understand personal space boundaries: Well this can be true but over a while, he has learned it, he won’t invade anyone’s personal space. He is happy with his space and if anyone wants to join him, welcome but don’t disturb him.
Has trouble understanding other people’s feelings or talk about their feelings: Shaurya understands other people’s feelings but doesn’t know how to comfort or how to react. If we are sad, he won’t disturb us, he will realize something is wrong. He doesn’t know how to talk but can express his feeling and he would seek attention.
Avoids or resists contact: Not true for Shaurya, he loves physical contacts, he likes the warmth of that hug. It might be true for strangers for sure.
Only interacts with others to achieve the desired goal: He does not interacts, he takes it. Well if he is very fond of cars and looking at the keys, he can tell us the make and brand. In a public place, if he sees a key with someone, he at times will run to the person to see the key brand and that can be embarrassing. He would hold the key, that’s it, but for the others, it’s awkward. We have to be watchful of his movements in shopping complexes.
With family members, he is very interactive to get the desired result, he can even speak a few words to get this done of his liking.
Has flat or inappropriate expression: Not in the case if Shaurya, he has an appropriate facial expression, he will show all his expression possible. It does get inappropriate at times because of echolalia.
Does not share an interest with others: Except for family members, this is true, he does not have friends to share his experience, he has been unable to make friends of his age.
Does not respond to their name even at 12 months: This is true in our case as well, he reacted to his name when he was ~3
I hope this helps, there are no guiding principles or symptoms which fit everyone, we can take cues, but in the end, it’s all our observation of the specifics. Very important to identify the improvement opportunities early to enable learning accordingly.