Meet the 'milk mommas' who share an unbreakable bond - by donating their breast milk to feed each other's babies in their hours of need. Kelly Brennan, 30, gave nine liters of milk to her friend Susie Schmitt, 32, and both women later turned to Kelly’s college classmate Brittany Wigman, 33, for help. Brittany - an 'overproducer' - had more than enough milk to feed her own baby, so gave Kelly and Susie 30 liters from her precious stash. Despite Brittany and Susie not knowing each other at first, the women - who have nicknamed themselves the 'milk mommas' - say they now share an unbreakable bond.