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  • Title: Fertility after childbirth: pregnancy associated with breast feeding.
    Author: McNeilly AS, Glasier AF, Howie PW, Houston MJ, Cook A, Boyle H.
    Journal: Clin Endocrinol (Oxf); 1983 Aug; 19(2):167-73. PubMed ID: 6883735.
    Abstract:
    During studies on the resumption of fertility postpartum in 12 breast feeding mothers who were using no contraception, eight pregnancies occurred. In seven cases these pregnancies occurred while the mothers continued to breast feed while in one it occurred within 2 weeks of weaning. In two cases pregnancy occurred prior to first postpartum menstruation but followed an abrupt decline in suckling frequency and duration resulting in resumption of follicular development and ovulation. In the remaining six cases, pregnancy was preceded by between 1 and 7 menstrual cycles, the majority of which (13/19) had deficient luteal phases or were anovular (4/19). In all mothers a significant decrease in the suckling frequency and duration observed during lactational amenorrhoea had occurred prior to the resumption of ovulation and conception. No mother conceived with a suckling frequency of greater than three times per day although some mothers ovulated without conceiving when suckling four times per day. The results suggests that if a breast feeding mother wishes to rely upon the infertility associated with lactational amenorrhoea, she must suckle at least five times per day with a total suckling duration of more than 65 min per day (more than 10 min per feed). Any reduction below either of these limits may result in a return of fertility. During studies on the resumption of fertility postpartum in 12 breastfeeding mothers who were using no contraception, 8 pregnancies occurred. In 7 cases, these pregnancies occurred while the mothers continued to breastfeed, while in 1 it occurred within 2 weeks of weaning. In 2 cases, pregnancy occurred prior to 1st postpartum menstruation but followed an abrupt decline in suckling frequency and duration resulting in resumption of follicular development and ovulation. In the remaining 6 cases, pregnancy was preceded by between 1 and 7 menstrual cycles, the majority of which (13/19) had deficient luteal phases or were anovular (4/19). In all mothers, a significant decrease in suckling frequency and duration observed during lactational amenorrhea had occurred prior to the resumption of ovulation and conception. No mother conceived with a suckling frequency of greater than 3 times/day although some mothers ovulated without conceiving when suckling 4 times/day. The results suggest that if a breastfeeding mother wishes to rely on the infertility associated with lactational amenorrhea, she must suckle at least 5 times/day with a total suckling duration of more than 65 minutes/day (more than 10 minutes/feed). Any reduction below either of these limits may result in a return of fertility.
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