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The continuing of breastfeeding, while introducing solids after 6 months, to 12 months were shown to have an efficiency rate of 92.6 – 96.3 percent in pregnancy prevention. [13] Because of this some women find that breastfeeding interferes with fertility even after ovulation has resumed. The Seven Standards: Phase 1 of Ecological Breastfeeding
While breastfeeding, prolactin suppresses gonadotropin secretion, potentially delaying ovulation. Ovulation may resume before the return of menstruation during this time. [2] Although hyperprolactinemia can result from normal physiological changes during pregnancy and breastfeeding, it can also be caused by other etiologies.
Erythropoietin, which stimulates red blood cell production, increases throughout pregnancy and reaches approximately 150 percent of their pregnancy levels at term. [24] The slight drop in hematocrit or hemoglobin is most pronounced at the end of the second trimester and slowly improves when reaching term. [24]
High levels of prolactin during pregnancy and breastfeeding also increase insulin resistance, increase growth factor levels (IGF-1) and modify lipid metabolism in preparation for breastfeeding. During lactation, prolactin is the main factor maintaining tight junctions of the ductal epithelium and regulating milk production through osmotic balance.
Estrogen, progesterone, and human chorionic gonadotropin (hCG) levels throughout pregnancy. Estrogen, progesterone, and 17α-hydroxyprogesterone (17α-OHP) levels during pregnancy in women. [ 1 ] The dashed vertical lines separate the trimesters .
Prolactin has a wide variety of effects. It stimulates the mammary glands to produce milk (): increased serum concentrations of prolactin during pregnancy cause enlargement of the mammary glands and prepare for milk production, which normally starts when levels of progesterone fall by the end of pregnancy and a suckling stimulus is present.
Women who experienced delayed OL reports the absence of typical onset signs, including breast swelling, breast heaviness [6] and sense of breast milk "coming in" [8] within the first 72 hours postpartum; nevertheless, some reports suggest that the sensation of "milk coming in (to the breasts)" is resultant of milk production overshoot instead.
The caloric needs will change based upon the production of milk for the infant. The caloric requirement for a non-breastfeeding, non-pregnant woman changes from 1,800-2,000 kcal/day to 2,300 to 2500 kcal/day for the breastfeeding woman. Nutritional supplementation is often prescribed and recommended.