The BAB lists six references for this information on page 352 (including Lawrence, Riordan & Auerbach, and an article in JHL). I think what Dr. Newman said recently about this was most interesting (and I am not quoting, just recalling) that if all it took was the little bit of oxytocin released during breastfeeding to cause a miscarriage, then doctors would use that little bit of oxytocin to do abortions - and they do *not* do this! Just attach a breastpump for a few minutes to a mother who wants to end a pregnancy, and there you have it... Lisa Jones, LLLL in Wellington Florida