New research on a Neanderthal infant discovered in Amud Cave in Israel suggests that these ancient humans may have grown much faster in early infancy than modern humans. The remains, dated to around 51,000 to 56,000 years ago, include about 111 bone fragments and represent one of the most complete Neanderthal infant skeletons ever found. Dental analysis indicates the baby was about five and a half months old at death.

Despite this young age, the infant’s arm and leg bones resemble those of a modern human child closer to 13 to 14 months old. Estimated body length, between 70.3 and 78.6 centimetres, is also significantly larger than expected for a modern human infant under six months. Researchers believe this points to a period of accelerated growth shortly after birth, rather than differences during fetal development.

Scientists suggest this rapid early growth may have been an adaptation to the colder Eurasian climates where Neanderthals lived. A faster development of strength and robust physical traits could have improved survival in harsh Ice Age conditions. The skeleton also shows adult-like Neanderthal features emerging early in life, indicating that their species-specific traits appeared sooner than in modern humans.

Although based on limited fossil evidence, similar findings in other Neanderthal remains support the idea of a distinct developmental strategy. The study adds to growing evidence that Neanderthals followed a different biological path from modern humans, particularly in how their bodies grew and matured during infancy.