There are some tell-tale signs to be aware of in children or infants. Lack of speech, lack of eye contact, non-reactive to environment (seems deaf), no pointing

There are some tell-tale signs to be aware of in children or infants. Lack of speech, lack of eye contact, non-reactive to environment (seems deaf), no pointing. Repetitive behaviors and obsessions/compulsions can start to show early as well. Even things like toe-walking are very common (though toe-walking isn't exclusive to autism, but can be an indicator).