Does anyone have information on the role of heavy exercise (running several miles every day or two) on lactational amenorrhea and infertility? One of my clients would like to become pregnant again soon, without weaning her 9 month old, and preferably without stopping running and exercising, though she is willing to sacrifice that. Time is of the essence for her. Any suggestions? She is an allied health professional, and would appreciate any references on exercise and prolactin release or exercise and infertility, or even any speculation. TIA, Catherine Watson Genna, IBCLC NYC [log in to unmask] (I wish to apologise for being scarce lately, my father in law was just diagnosed with cancer, seems to be treatable.)