From what I gather, you don't need a Birth Cert. in 140 stage, that is for 485 (but I guess you are talking about concurrent processing).
In any case, I think all you would need for I-140 is:
1. Verification of employment showing experience that match requirements.
3. Proof of education.
2. Company's financials showing ability to pay (audited financial statement or letter from CFO)
3. Proof of legal non-immigrant status in the US.
4. Filing fee.
Can some one please confirm this?
Also, are most of you thinking of concurrent processing? I am still playing around with the idea of CP - do you know how long that takes after 140?
Thanks,
DG