Your case did not skip any stages. Your petition was approved, not your visa.
It will now be forwarded to NVC for further processing and then you will have the interview. If approved then you will get the visa issued.
You should research the next steps in depth as it can become confusing at NVC.
Find the current NVC thread for input and feedback and post questions there as they arise.
Your baby is due in November, you will have time to make it if you get a decent interview date, sorry no expedites for a birth.
How soon you will get done with NVC depends on how well you understand the process and how proactive you are in sending your
documents.
Hopefully within 3 months or so you will have visa in hand.