GARY PARKER / SCIENCE PHOTO LIBRARY GARY PARKER / SCIENCE PHOTO LIBRARY
Non-identical triplets. Twenty seven year old non-identical triplets pose together. In their mother's womb they were conceived simultaneously but developed from three separate eggs (ova). Non-identical triplets develop independently of one another and so each has their own placenta. Triplets occur in about one in 8000 pregnancies. Non-identical triplets are more likely to occur in older women, in women who have had many previous pregnancies, women who have a family history of triplets in the family and those on fertility treatment.
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