Hard to tell for sure but it's not very likely this will have any impact on your applications.

Yes, it could be that CIS needs to get your old file, and they could be impossible or very time consuming.

It takes about 30 - 400 days to get a work permit based on a pending application for adjustment of status.

USCIS can contact your prior employers if they choose.

There is no rule against approving the application. But rather you are missing proof of joint residence and you will need other proof that the...

The H4 was approved in error and in fact you are an H1b it seems to me. See a lawyer for what steps you may need to take.

It is self explanatory. If you need a lawyer, you should hire a lawyer.

It seems to me that you are subject to the cap, although you could argue since you had an H1b within the last six years you are not subject to the...

Yes, his mother can file an immigrant visa petition for him. No, he is not permitted to stay in the U.S.

Giving birth in the U.S. does not change your status, and does not qualify you to file any application to change your status.