What (a) was the infant mortality rate at the Chris Hani Baragwanath Academic Hospital in each of the past three years, (b) number of healthcare workers in the same department have since been employed at the specified hospital, (c) number of obstetrics ambulances have been procured to date at the hospital, (d) plans are in place to ensure that infant mortality due to negligence, lack of healthcare professional personnel is (i) avoided and (ii) reduced, (e) targets has his department set in this regard in the past year and (f) number of the specified targets have been achieved?