I hope you arent' asking this because of Grey's anatomy. If you are, reconsider your career choice now.
This is a SUPER specialized question, many, many steps beyond a pre-med should know or care about. There aren't many fetal surgical centers. Lots of places do TTS cases and EXITs; they're usually done by an MFM. The Cards issues if anything just get a shunt with a big catheter done by the peds cards surgeons. I'd say the rarest and the hallmark of a good program is myelomeningocele repairs, done at CHOP and, UCSF. I can really only speak to CHOP where I've scrubbed in on some. The department is led and chaired by Dr. Scott Adzick, a pediatric surgeon. He invented the device to open the uterus and amniotic membrane. The MFM holds the US probe and directs where to cut. The peds surgeon enters the uterus and closes it. The peds neruosurgeon closes the MMC. The MFM cares for the pregnancy and does the Csection afterward. At UTSW the department is led by an MFM.
Resident and even fellow involvement is nonexistent to minimal. Get through your first 2 years of med school, see what your interests are, then start thinking about fetal surgery; the field could be vastly different then.