You can get pregnant while breastfeeding. However breastfeeding infertility and natural birth spacing does work with the right kind of breastfeeding. Using nature as the norm, a mother using the Seven Standards of ecological breastfeeding may experience, on average, 14 to 15 months without cycling. In other words, for a nursing mother to go 1 or 2 or 3 years without menstruating is not abnormal. The Seven Standards are merely maternal behaviors associated with breastfeeding infertility. Interested couples can read The Seven Standards of Ecological Breastfeeding, a short, readable and inexpensive book, available at amazon, Barnes & Noble, etc. and as an ebook.