She could have an amniocentesis performed, but from what I understand, it can have harmful effects on the baby.
http://www.google.com/search?hl=en&ie=UTF-8&q=amniocentesis+and+paternity&spell=1
Yes, thank you for that. I found the same information.
The last thing either of them want is to possibly harm the baby, even if it isn't his.
A local hospital told him they had to wait until the baby is born. Planned Parenthood told him that a test can be done after the 5th month.