Sung Tzu Niang Niang – Her themes are prayer, kindness, children and offerings. Her symbols are dolls. Called ‘She Who Brings Children’ in the Far East, this Goddess had abundant energy that not only generates fertility but also instills a kinder, gentler heart within us. Sung Tzu Niang Niang is said to always listen to and answer prayers addressed to Her with compassion.
Traditionally, childless couples bring an offering of a special doll to this Goddess today and pray for physical fertility. For couples wishing for natural or adopted children, this ritual is still perfectly suitable. Find any small doll and dress it in swatches of your old clothing, or bind a piece of both partners’ hair to it. Place this before your Goddess figure and pray, in heartfelt words, to Sung Tzu Niang Niang for Her assistance.
On a spiritual level, you can make any artistic representation of areas where you need productivity or abundance and give it to the Goddess. In magic terms, these little images are called poppets. For example, stitch scraps of any natural silver or gold cloth together (maybe making it circular like a coin) and fill it with alfalfa sprouts. Leave this before the Goddess until more money manifest. Then, give the poppet to the earth (bury it) so that Sung Tzu Niang Niang’s blessings will continue to grow.”
(Patricia Telesco, “365 Goddess: a daily guide to the magic and inspiration of the goddess”.)
Also seen as Song-zi niang-niang and Sung-tzu niang-niang.
Wikipedia states that ” Songzi Niangniang (‘The Maiden Who Brings Children’), also referred to in Taiwan as Zhusheng Niangniang, is a Taoist fertility Goddess. She is often depicted as Guan Yin Herself in drawings, or alternatively as an attendant of Guan Yin; Guan Yin Herself is also often referred to as ‘Guan Yin Who Brings Children’. She is depicted as an empress figure, much like Xi Wangmu and Mazu.” 
Marks, Dominic. Lowchensaustralia.com, “Chinese Goddesses – Song-zi niang niang“.
Wikipedia, “Songzi Niangniang“.
Chamberlain, Jonathan. Chinese Gods: An Introduction to Chinese Folk Religion (p. 160).
Holymtn.com, “The Legend of Quan Yin: Goddess of Mercy“.
Javewu.multiply.com, “Pictures of Bi Xia Yuan Jun“.
Pregadio, Fabrizio. The Encyclopedia of Taoism: 2-volume set.
Took, Thalia. A-Muse-ing Grace Gallery, “Kwan Yin“.
Wikipedia, “Songzi Niangniang” (translated from Dutch).
Wikipedia, “Mount Tai“.