Mothers and Newborns Health Insurance Act of 1999

Mothers and Newborns Health Insurance Act of 1999 - Amends title XXI (Children's Health Insurance) (CHIP) of the Social Security Act to give States, subject to specified guidelines, the option of providing for: (1) coverage of pregnancy-related assistance for targeted low-income pregnant women under the State's CHIP plan; and (2) automatic eligibility for child health assistance under the State's CHIP plan for children born to targeted low-income pregnant women receiving such pregnancy-related assistance when the child is born.