Three expectant mothers have also been told their babies have the condition, Stella Coffee, 38, Chantelle Stevens, 23, and Mrs Green's daughter, Natalie.
Sheila Brown, of the Newlife Foundation for Disabled Children, said: "Gastroschisis is believed to be the fastest growing inborn condition in the UK."
A Department of Health spokesman said the letter had not yet been received but would respond when it arrives.