You won't search long before finding folds on a baby's body.
Some are clearly visible as they furrow through the immaculate skin.
But when did these folds first appear?
Some of the folding, such as the vertical folds, seems to be part of the fetus development process.
For example, during its growth, the fetus expands in two symmetrical halves with a clearly visible center line.
This means that the center fold is present from the very start of our life.
When the fetus starts moving, this creates still more folds.
Since its skin is folded so little, the fetus can do stunning facial expressions.
The flesh isn't attached to the skull yet.
At around four and a half months, thumb sucking starts.
The baby is, in fact, exercising its members in order to be ready to perform after birth.
Its movements generate folds in the skin, mostly in the neck-shoulder-arm area and in the leg-hip area.
Ironically, babies who do a good job at thumb sucking and exercising their members, in order to be ready to be breast fed after birth, are more folded.
Small problems during the pregnancy may produce several folds in the skin as the child grows up.
You can tell how folded a baby is at birth by evaluating how ugly it is.