Here is a link to a good piece by Carter Snead on the constitutionality of laws (such as the recent Texas law) banning abortion after 20 weeks to prevent fetal pain. http://www.thepublicdiscourse.com/2013/07/10524/
Here is his conclusion: “In summary, the Constitution does not prevent Texas from taking this very modest step to protect unborn children. There are no Supreme Court precedents that grapple with the unique features of SB1, and the powerful, novel state interest in which the bill is grounded. Relevant precedent suggests that a majority of the Court would treat the new state interest in protecting the lives of unborn children capable of experiencing pain as sufficient to justify the new law.”
Richard M.