- Belly button for recognizing: Every child has a belly button but there are difference in the belly button of child who is single and the two twins have also different belly button shapes because of removing umbilical cord the shape of belly buttons of both kids is different and slightly unique.
- Adaptability of women to feed: A woman’s body is highly adaptable to feed at a time to two babies it is natural system of woman to have capacity of feeding babies more than one at a time.
