Roedd y grŵp, dan gadeiryddiaeth yr obstetregydd ymgynghorol a'r gynaecolegydd, Dr Richard Penketh, yn cynnwys tîm amlddisgyblaethol o glinigwyr, academyddion a chleifion.    Fe ystyriodd nifer o ffynonellau data, gan gynnwys canllawiau ac ymchwil diweddar NICE yn ogystal â thystiolaeth newydd a gynhyrchwyd yng Nghymru.
The Group, chaired by consultant obstetrician and gynaecologist, Dr Richard Penketh, was made up of a multidisciplinary team of clinicians, academics and patients.  It considered many sources of data, including recent NICE guidelines and research as well as new evidence produced in Wales.