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Twins are formed in one of two ways. Fraternal twins are most common, with each developing baby having its own placenta and amniotic sac. Two separate eggs from the mother are fertilised by two separate sperm cells from the father. These two children, although of the same age, will not be more alike than any other siblings, although they often share a closer bond, probably due to their communication in the womb and their shared babyhood.

Identical (or maternal) twins are formed when an already fertilised egg cell divides into two, for reasons not yet clearly understood. The genetic material of each twin is then identical in most aspects and for this reason these two children will look almost identical, although birth weights might well differ. The sex will always be the same and usually the blood group too. It is important to remember, however, that their personalities are not necessarily the same.