Like I posted before, it took some digging to find doctors and hospitals that were pro-natural birth, pro-lactation, and pro-rooming in (alojamiento conjunto). The general term for this here in Mexico is psicoprofiláxsis. Below is a small list of resources I came across as I was researching having a natural birth in Mexico.
Links to Mexico resources from Midwifery Today
Hospital Medica Sur - Lomas (women's hospital that specializes in maternity)
The psicoprofiláxsis community is quite small here in Mexico, and nearly all of them have contacts in other cities besides DF if you can't find what you're looking for on your own.