Seeing the picture of the baby with two heads, is your first reaction a charade or fear? Most people are staring at the grotesque look of two heads while completely ignoring the deadly truth about the connection between the back bones. This rare conjunctural malformation is not a simple "replicating paste" and the way in which the spinal column is integrated with the thorax directly determines the boundaries of the operation. You think it's just an extra head? It's a mistake to actually let a surgeon sweat on the operating table, the anatomical knot hidden under a shared vein. If this critical structure is not understood, any attempt at separation is tantamount to a direct death sentence. Do you dare to look at the bloody medical game behind this picture?

You may not have noticed that the number of bones in babies is completely different from that of adults.——At birth, there were more than 270, nearly 70 more than the 206 for adults. The bones that look like "excessive" are not burdensome, but are connected to the cartilage that is hidden in the skull and the gill, and they will be cremated and boned in the years to come, and will eventually be shaped into adult skeletons that you know. But in this silent bone remodelling project, there is a risk window that is ignored by the vast majority of parents: Some of the seemingly normal "soft bones" are early signs of abnormal growth. Which are the areas where the skeletal delay requires vigilance and which are normal individual differences?