4 month old baby noises and autism

I know autism isn’t usually diagnosed until 1-2 years old sometimes even 3-4 years. And I know looking stuff up sometimes makes things worse and I’m this case it has for me. Our baby, who is about 6 days from 4 months now. When she’s been awake and is about ready for a nap. Especially when she’s ready for her night sleep while winding down she usually starts making almost like a throaty growling sound. Me and my wife jokingly say she sounds like a velociraptor. But then when I’ve now looked it up, I’m seeing that I should be looking for early signs of autism. Where as before I just thought it was a sound she discovered and sometimes make when she starts getting cranky and time for a nap. Usually her morning nap and night sleep, is when she does that noise the most. I guess I’m just looking for someone to ease my mind and tell me their experience with something similar. Me and my wife are first time parents and we like I think most parents are overthinking everything. Thanks in advance! :) <3