I done some research for myself on both of these issues. Now the loud noises I found that could be linked to autism. My daughter is very smart for her age, talks fine, and plays with other kids just fine. It also says that the loud noises can stand alone (meaning not in the autism spectrum) just the thought if my child having autism scares me.
As for her walking on her tip toes it says until age 2 it's nothing to be concerned about. Now my daughter will be 2 in Janurary so here is what I found about it. After age 2 and they are still walking on tip toes it can be a few things including:
-short Achilles' tendon
Now here's the real kick in the face for me.. It's also a type of autism.. As I said before my little girl doesn't have a problem socializing, playing with other kids, etc.
It's very scaring for me to think my little girl could have autism.. Does anyone have any advice or anything? :(