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The longest recorded human pregnancy lasted 375 days (12.5 months).

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The record for the longest recorded human pregnancy is one of those extraordinary medical anomalies that stretches our understanding of human gestation. Normally, a typical pregnancy lasts about 280 days, or 40 weeks, from the first day of a woman's last menstrual period. However, in the exceptional case of Beulah Hunter, a 25-year-old woman from Los Angeles, California, in 1945, her pregnancy reportedly lasted a staggering 375 days (approximately 12.5 months), far exceeding the usual gestation period.

This unique case was carefully documented by her physician, Dr. Daniel Beltz. What unfolded was not just a fascination for medical science but also for the general populace. According to further medical investigations into this unusual case, one theory that emerged was that Beulah's baby had experienced an exceptionally slow development in utero, possibly due to hormonal or metabolic factors that might have delayed the gestation process.

Despite initial skepticism from the medical community, detailed records and multiple observations confirmed the validity of these claims. Tests conducted, including serial X-rays over the period of her purported extended pregnancy, marked the development stages of the fetus, thus offering evidence that the pregnancy was indeed prolonged.

Beulah Hunter finally gave birth to a healthy baby girl named Penny Diana. The infant weighed a normal 7 pounds 6 ounces, showing no abnormal effects from her extended stay in the womb. This record-breaking event, fraught with medical anomaly and subsequent analysis, highlighted the variability of human pregnancy and showcased the resilience and extraordinary capabilities of the human body. Such cases remain a rare occurrence in medical history and continue to pique the interest and curiosity of obstetricians, researchers, and the public alike.