New born babies swimming, completely comfortable in an under water environment, amazing! Add in the fact that human babies are born with extra layers of body fat below the skin, which is essential for buoyancy and insulation in a water environment, that is unlike land mammals and very much like the water mammals.
Putting aside the evolution or creation debate, ask how does the design follow function? Elaine Morgan has simply pointed out scientific observations, that are pretty hard to argue against. Because her theory conflicts with the establishments "savanna" theory, her research was rejected by paleo-anthropologists.
The scientific community can be wed to the same belief dogmas that they are so quick to criticize others for. This little lady without a PHD from an ivy league university has dis proven their savanna theory, which was their basic theory of early human evolution. Oopsies, time to rewrite the text books!