The First Signs of Autism I Noticed in My Child

What signs did you notice first and when?
My son always screamed when I bathed him from the first day. Also, he wouldn't give much eye contact around 5 weeks of age. This was what I picked up on.
As time went on, was there a progression of symptoms that became more obvious?
Delayed speech, low muscle tone, very hyperactive, screaming a lot, and not making friends
How did your pediatrician and health team come to a diagnosis?
DSM 5, at hospital unit
What advice would you give parents trying to recognize the signs?
Lining up toys, running away from you, having obsessions, being fussy eaters, not liking their hair touched (haircuts and washing their hair is very hard), and a delay in speech.