Who is the patron saint of nursing mothers?

According to Nigel Pennick in his book The Sacred World of the Celts, St Gwen Trierbron is the patron saint of nursing mothers. She is depicted having three breasts. He says her predecessor is the Celtic goddess Fuinche who also has three breasts. A short biography of Gwen Trierbon can be found at http:/www.earlybritishkingdoms.com/biOS/gwentby.html