With all due respect to Justice Sotomayor, it is not a minority of doctors who believe an unborn child can feel pain before 24 weeks.
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It is well-established medical practice to provide anesthesia to the unborn child regarding medical procedures performed before 24 weeks because the nerve endings, which generate pain, are well-developed.

Why administer anesthesia to unborn children before 24 weeks if pain is not involved?
I have asked medical professionals: “Would you perform medical procedures to save or improve the life of an unborn child in the 20 week period without administering anesthesia?”

It is virtually unanimous that anesthesia is appropriate.
Justice Sotomayor is misinformed (and that is dangerous) about how medical procedures are performed on unborn children.