Ghee,
Here's my timeline:
Sep 01: I-485 Medical tests. We are trying for pregnancy, on the date of exam it cannot be medicaly determined whether wife is pregnant or not, so tests cannot be completed for her or myself. Doctor notes this on medical exam form.
Dec 02: RFE #1 asking for completion of medical tests. Verbiage is like "Complete medical tests when not pregnant...". Wife is pregnant with EDD (expected delivery date) of May 2003 so we ask for waiver based on USDH's guidelines. Wife is CLEARLY eligible for waivers. We send in a note from the civil surgeon and wife's gynecologist. My medical tests are completed.
Feb 02: RFE #2, photocopy of RFE #1! We have to respond before May. We don't know what to do, so it takes a while to figure out a strategy. Just to be sure, we send in my medical reports again. For wife's case we tell BCIS that it's impossible to complete medical tests before May and we need more time. Since they are not allowed to extended the response time for an RFE, they have to issue us a new one or grant waivers.
May 03: My EAD is extended.
Jun 03: Wife applies for AP extension. Company applies for my AP extension.
Aug 03: Fingerprints expire. No news from BCIS. Wife's AP extended. My AP being processed (I hope!).
I have no idea what's stopping them from adjudicating my case. Anyway, we don't want to push the issue at this time since after consultation with our pediatrician we found out that with a newborn the longer my wife can wait before taking the varicella (live attenuated vaccine with risk of transmission) shot the better it is.
> I wonder what happens if there is another pregnancy during the RFE?
The wait time is a minimum 15-16 months. 9-10 months for the birth and then 6 months before it is safe to take shots with minimum risk of transmission. YES this is ridiculous! So much is "grey" in this area that it's purely up to the adjudicator. Don't think the BCIS cares about USDH's guidelines. Don't know why they even have waivers. If a medical waiver is not granted, others (moral objection - huh!) have NO chance of being granted.
There needs to be CLEAR instructions from the BCIS on this matter. What I would recommend is granting a conditional green card and allowing 2-3 years for removal of conditions.

Without that, it's purely up to you to argue your case.
Waiting...