Because it becomes an independent human being. One that can actually breath. Consume.
Even Adam didnt have life until god breathed into him
Just out of curiosity, if humans were like Marsupials, when would we be human?
Birth Before They’re Ready
One of the most astonishing facts about marsupial young is how undeveloped they are at birth. In kangaroos, for instance, the newborn, called a joey, emerges from the mother’s birth canal after just 33 days of gestation. It is barely two centimeters long—about the size of a jellybean—and weighs less than a gram. It has no functional eyes, no ears, no fur, and no ability to regulate its own body temperature. In most species, the forelimbs and mouth are more developed than the rest of the body, which is crucial for the next vital step: the climb.
Immediately after birth, the joey begins a journey that is both perilous and heroic. With forelimbs adapted for grasping, the tiny creature climbs from the birth canal, across the mother’s fur, and into the pouch. This instinctual migration is not guided by sight or sound, but rather by innate tactile responses and chemical cues. Once inside the pouch, the joey finds a teat, latches on tightly, and begins to feed. This moment marks the start of a second, much longer developmental phase—one that takes place entirely within the pouch.
Also, are Eagle eggs more valuable than a human fetus?
According to the state they are.