No worries about prenatal care or WIC if these are the benefits.
(1) See the blog from pjiang: http://blog.wenxuecity.com/myblog/14332/200911/42910.html#WIC
(2) See the website that 863211 once recommended:
http://www.uscis.gov/news/fact-sheets/public-charge-fact-sheet
Many thanks to both masters for helping on this website all these years.