The 24th week is often set as the legal upper limit for medical abortion. At this point in time, the milestone that is reached by the developing fetus is

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The minimal age of viability, which is the point at which a fetus has a chance of surviving outside of the womb with medical assistance, is generally considered to be around 24 weeks. This indicates that by 24 weeks, the fetus has developed enough that it may be able to survive if delivered prematurely. Therefore, this is often used as the legal upper limit for medical abortion. While the other options mentioned (heart and circulatory system functioning, spontaneous movement, and sex differentiation/organ development) are also important milestones in fetal development, they typically occur earlier than 24 weeks.

The 24th Week Is Often Set as the Legal Upper