Twins, triplets or more are individuals already, by virtue of the fact that they have physically separate bodies and brains. Families can either enhance or obscure their multiple-birth children's individuality, but they need not create it. That has been taken care of already. Parents sometimes tell us they feel guilty that in the chaotic and exhausting early months, they are unable to give each baby much individual attention. Each child experiences these simple acts with his or her own sensory equipment, storing them away in each one's personal memory bank as feedback from the external world.
Parents have their hands full just attending to the physical care of their babies.
Here are some simple yet very helpful and important things parents and other family members can do to promote healthy identity formation in their multiples. Give them distinctly different names. If they do have very similar sounding names, you may want to use a nickname or middle name for one or both to lessen confusion. Give them each their own clothes and avoid dressing twins alike on a regular basis past infancy. Few families can resist the adorable image of identically dressed babies, and there is no harm in this during the first year or two.