Figure 4.

Representative hormone, mucus, and temperature profile of a woman with relatively early ovulation prior to the end of full breastfeeding (green, yellow, blue as described in Figure 1, red represents menses). Two arrows represent the end of full breastfeeding with the introduction of formula or solids (5.0 months) and complete weaning (5.7 months). The dotted line is the PDG threshold of 9 µmol/24 h as the biochemical criterion for ovulation.