Be careful, OP. There is a sinister (IMO) corner of social media looking to convince people that their child is autistic, at a very very young age, much younger than medical professionals would be confident to advise.
It also seems to be a very autism-negative corner. So as well as this "signs your baby might be autistic" (most of which are perfectly normal signs of being e.g. a 10 month old baby, and are only signs of autism if they are still remaining at the age of 2, 3, 4, etc) there is a helping of fear and paranoia, extremely negative portrayals of autism, stories of regressions, of children losing skills, of adults with very high support needs who need lifelong care and will never be independent.
I appreciate you have RL experience of an autistic adult with very high support needs. So it's not only coming from here. But beware because the combination of this very early "look for signs!" and the anti-autism feeling tends to be a hidden pipeline to misinformation and pseudoscience. It's either antivax stuff trying to warn you away from vaccines and "mainstream medicine" entirely by drawing a link between vaccination and autism (even though this link has been studied so many times, and widely debunked). Or, maybe worse, it's trying to sell you expensive and ineffective supplements or dubious "treatments". Some of these actually veer into being extremely harmful and dangerous.
These pipelines are very dangerous. Not only for the direct harm they do to children who are harmed by the worst "treatments", but they do untold harm as well to the mental health of parents sucked into this worry, spending every interaction with your baby looking for signs she might be autistic is not healthy. You should be enjoying her at this age. I think it's cruel what they take from parents. And I think it also causes harm to the parent/child relationship because of this same thing, it gets in the way of you getting to know your baby and delight in her as the unique and special individual she is.
And then lastly I think they do a lot of harm when children do turn out to be autistic - which is not actually that uncommon, because it's not unusual to be drawn to this kind of thing because you have a family history of it, as you've found. As you know, autism is a spectrum and covers a wide, wide range of different abilities and challenges. Focusing on how hard it is to be autistic or how hard it is to have an autistic child is a devastating way to see it.
To be perfectly honest I would recommend shutting off the social media entirely, ESPECIALLY tiktok or anything else which will feed you new content via an algorithm, rather than just seeing content from accounts you follow, and looking for IRL therapy to try and change the narrative and the anxiety. But if you don't want to do this or can't do this, then what I would suggest to do instead is try to change the content of your feeds by blocking anything negative or scaremongering and looking for neurodiversity-affirming content instead. Content that celebrates autism and looks to educate people about the differences in neurotype and help people understand autistic individuals rather than demonising autism or frightening people that their child might be "broken". And stay away from "for you" pages or suggested content, try to stick to the settings which only show you stuff you're actually subscribed to.
Since I don't know if this would be helpful for you or harmful, I won't suggest any accounts but if you do want me to, I can. I'm a bit reluctant to because TBH, I follow a lot of the autism-positive/neurodiversity-affirming type content but I STILL get a lot of pseudoscience showing harmful misinformation. I can spot it fairly easily and block it, but if I was in a more anxious place then I might not be able to do that.