Lactational amenorrhea/anovulation and some of their determinants: a comparison of well-nourished and undernourished women  Sudharshani Wasalathanthri, B.S., Kamani H Tennekoon, Ph.D.  Fertility and Sterility  Volume 76, Issue 2, Pages 317-325 (August 2001) DOI: 10.1016/S0015-0282(01)01876-3

Figure 1 Cumulative percentages of women resuming regular menstruation (A) and regular ovulatory menstruation (B), by time postpartum in well-nourished (n = 30, ○) and undernourished (n = 30, •) subjects. Wasalathanthri. Lactational amenorrhea/anovulation. Fertil Steril 2001. Fertility and Sterility 2001 76, 317-325DOI: (10.1016/S0015-0282(01)01876-3)

Figure 2 (A), Total number of breast feeds per 24 hours. (B), Total number of formula feeds per 24 hours. (C), Prolactin concentrations. All are according to the time of onset of regular menstruation in well-nourished (n = 30, open bars) and undernourished (n = 30, striped bars) subjects. Menstrual week 0 indicates the time at which regular menstruation resumed. Wasalathanthri. Lactational amenorrhea/anovulation. Fertil Steril 2001. Fertility and Sterility 2001 76, 317-325DOI: (10.1016/S0015-0282(01)01876-3)