At What Stage of Development Does Fetus Feel Pain?
Although there is some controversy, most doctors agree that a fetus can feel pain inside the womb. In utero tests reveal different responses to stimuli in different developmental stages.
Other People Are Reading
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20 Weeks
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It is widely accepted that a fetus begins to feel pain around 20 weeks into pregnancy. By this time, the baby's tissues, muscles and nerves are developed.
Early Tests
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Studies using ultrasounds have shown that a fetus reacts to stimulation in the womb. For example, neurobiologist M. Fitzgerald reported in "Neurobiology of Fetal and Neonatal Pain" (1994) that at 7.5 weeks' gestation, a fetus responds to stimuli. Around 10.5 weeks, a fetus whose mouth region is touched will bend his or her head in response, and the palms of the hands become sensitive to stroking. The rest of the body and legs become sensitive at approximately 13.5 weeks.
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Development of Sensitivity
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Shortly after the development of sensitivity, repeated skin stimulation results in generalized movement of all limbs. This excitability has been interpreted as evidence that the fetus feels pain, reflecting an immature but intact pain response, according to R.G. Barr's article, "Pain Experience in Children" (1994).
Differing Opinions
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Fitzgerald states that prior to 26 weeks, the brain fibers necessary for pain and responding to it have not yet connected to the cerebral cortex. Similarly, Planned Parenthood claims it is unlikely that a fetus can feel pain before 28 weeks.
Real-Life Evidence
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Any pregnant mom can tell you that her baby definitely reacts to outside stimuli. Shining a flashlight near her tummy will cause the baby to move away around 16 weeks. As early as 12 weeks, a poke to the abdomen will make the baby squirm in response, even though mom won't feel it for a while.
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