Final answer:
The HHS regulations provide additional protections for children under healthcare programs like Medicaid and CHIP, and while the question does not explicitly ask about them, the elderly and disabled also receive significant protections and spending.
Step-by-step explanation:
In accordance with the regulations from the U.S. Department of Health and Human Services (HHS), additional protections are provided for certain vulnerable populations in healthcare. This includes not only pregnant women, fetuses, and neonates, but also other groups. Specifically, the subpart of HHS regulations provides additional protections for children. This can be seen in the context of Medicaid where a significant portion of enrollees are children, and programs like the Children's Health Insurance Program (CHIP) are designed to aid children from families with low incomes. Furthermore, although not explicitly mentioned in the question, the extensive spending on the elderly and disabled indicates additional protections and attention to these groups as well. There are also healthcare programs that serve other specific populations like military veterans and Native Americans.