Multiple Births Foundation Foundation based at Queen Charlotte and Chelsea Hospital. A small site, for both professionals and parents of twins+. Leaflets, books, and for those in London, a surprisingly frequent diary of talks on planning for multiple births, sleep, behaviour and more.

Tamba Twin and multiple birth association site, providing support and information for families of twins or more, recognising that this is a distinct experience from a single birth. Unable to offer support online, but lists specialist advisors at the office, helpline manned each weekday evening 7-11 p.m., 10 a.m. to 11 p.m. weekends, and facility to contact local groups. Membership offers discounts at a comprehensive variety of outlets from shoe shops to insurance companies.

The Twin to Twin Transfusion Syndrome Foundation Gives a full and clear explanation of twin to twin transfusion syndrome (TTS), a disease of the placenta which endangers identical twins during pregnancy and is reckoned to kill 4000 babies a year in the US alone. The symptoms of TTS are easy to spot and when diagnosed early the dangers can be much reduced. So it's well worth visiting if you're expecting identical twins.