Just to echo the posters above, trying to separate out the individual causes of our children's behaviours is probably the six million dollar question for adopters! It's only with the benefit of hindsight (I'm nearly 11 years in with a child placed as a baby), that I can begin to pinpoint differences between my daughter and her neurotypical/non-care experienced peers.
I think so much adoption training and advice (probably correctly) is predicated on the fact that there will be problems ahead, that we naturally adopt the brace position and become hyper vigilant to the nuances of behaviours.
I agree with Sassy above, though, you are the expert on your child and your gut instinct is important; it can be difficult to maintain this position, though, in the face of often differing opinions from the so-called experts! Just to corroborate Sassy, my child, placed as a baby with no significant issues, was recently registered blind, due to a very sudden and unexpected loss of sight. It's plain to me now that a lot of the physical manifestations of issues (never being able to learn to ride a bike, having the proverbial two left feet and always covered in bruises from clumsy trips and falls, among many others) were due to her complex eye conditions.
I've learned that the expression 'they all do that!' is a cross that adopters have to bear from well-meaning friends and family! My truth has been, yes, they probably do, but it's magnified to the power of a billion with my two adopted children.
If I had my time over again, I'd keep a diary logging concerns, dates and incidents, in order to help me identify patterns of behaviours (took me years to start to do this) and as evidence for any future possible interventions.