Why hospitals always keep newborn babies’ footprint?

Every woman who has given birth in hospital know that they will save newborn baby's fingerprints in their medical files. But why it is footprints not fingerprints?
The reason is that for getting footprint is very simple, whereas fingerprints of newborn babies are not complete and quite difficult to get, difficult in case of making vouchers.
In particular, this small footprint is also a memory for your baby’s first steps after birth, which is extremely significant, reports the feedytv.com.
Every day at hospitals there are thousands of babies born. Then they are brought to different rooms to check and recover before being transferred to their parents and family. Because newborn babies are identical, footprints is a recognizable sign for their families to get ‘right’ children, avoiding confusion and risks.
Another purpose is to help doctors easily check and manage medical files.
When a baby is born, parents must summit a birth certificate. Therefore, in India, a child’s birth certificate includes a fingerprint, which is equivalent to a true ‘identity card’ to legalize.
Baby’s footprints are taken and stored at the hospital. In addition, parents can also make a ‘copy’ of footprints save as a present during birthdays.