Nature - How Do Mammal Babies Grow and Get Born?

Most mammals grow their babies inside the mother's body before birth — but how does a tiny new life go from smaller than a seed to a wriggling newborn ready to breathe air? This episode traces the journey from a single fertilized cell to a fully formed baby, exploring how the placenta works like a lunch-delivery service, why different mammals have wildly different pregnancy lengths, and what happens in those first moments after birth. Along the way, listeners discover why some newborns can run within minutes while others are born helpless and hairless.