My older son we knew at that age it was obvious but he had other traits too. Even if they are autistic they will still grow and progress it’ll be ok ❤️
Having seen in the family - there were no obvious signs until post 1 year in that instance. I appreciate it's hard not to overthink, but as others have said - do get some professional support and assessment as babies do develop differently and what you've noticed isn't necessarily unusual for a 9 month old.
Equally so, much of what you describe is appropriate baby behaviour. Based on 26 years of experience in child development, I'd suggest giving your child a bit more time. If you are in the UK there is a check with the health visitor at around 12 months so you could raise your concerns then.
To be honest I really admire you for realizing your baby may have something. My friend son didn't respond to his name, not saying mama, dada, not pointing, was fascinating with wheels, rotating toys, twisting the wrist, fingers, switch lights on off. Crawling at 1 years old. And I told the mum and dad but they deny it, they say everything is ok , he is only a boy.
I knew my son was autistic from birth. Everyone said its too soon to tell but he was my 4th baby. I knew he was different. He's now 3.5yrs and diagnosed x