I looked at this patent and it seems (to me) most claims are too vague and that prior art apply for a lot of them.
Having a microphone in a stethoscope, sound capturing device or alike in not new, having electronics involving micro-controllers and DSP to do signal processing is not either. It seems also some inventors have also thought about having a central monitoring system. I found the patents below that might be interesting to consider:
US4086917 : Featl Heart Monitoring System (multiple systems connected to central monitoring stations) (May 1978)
US5932849 : Stethoscope having microphone therein (Aug. 1999)
US6002777 : Electronic stethoscope (Dec. 1999)
US7818050 : Passive Phonography Heart Monitor (Oct. 2010)
CN2525940 (Y) - Domestic electronic audio monitoring measurer for fetal heart rate
I also found an interesting publication:
Development of a low cost fetal heart sound monitoring system for home care application (Arun Kumar Mittra1, Nitin K. Choudhari2 - October 26, 2009)
Maybe someone could have a more expert reading of this application than mine and share the outcome.
Google link: https://www.google.com/patents/WO2011137930A1