Twins and more--1. Some current thinking on multiple births.

The incidence of multiple births is rising in many countries including the U.K., mainly as a result of treatment for infertility. Parents of twins, triplets or more require specific information, advice and support at all stages of parenting from diagnosis of a multiple pregnancy onwards. Specialist midwives have an important role to play in this, as do voluntary organisations such as the Multiple Births Foundation. The first part of this two-part article provides an update of some current thinking on multiple births, including twin-twin transfusion syndrome. Part two will provide information about the needs of families with a multiple birth in the early years.