At $6.5 million per year, a Medicaid program that pays for prenatal care for immigrant women is costing the state more than five times what officials predicted two years ago. The unexpected higher cost stems from Medicaid officials underestimating the number of women who would qualify and failing to factor in the cost of prescription drugs and hospital stays after deliveries. "I can't imagine the department missing the target so far on cost," said state Rep. Jay Bradford, D-White Hall. "And I'll have to follow up with them on that as chairman" of the Public Health, Welfare and Labor Committee....