The child still does not understand. Only to six months of a baby there is a sense of one's own body and sense of space around it. Experts from Goldsmiths College conducted a study with the participation of 4-6 month-old babies on his feet a little, the subjects attached the special devices, capable to tickle at the right time. About it writes The Daily Mail.
The device was involved, when children's feet were crossed or were parallel to each other. Scientists noticed that when children's feet were crossed, they knew what foot the device comes only in 50% of cases. It speaks about the imperfection of systems of orientation in space.
Note, some errors of the brain persist to adulthood. Many people are mistaken when someone touches the fingers of the crossed hands or feet. Doctors believe this is the norm.