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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.
Nutrition and pregnancy refers to the nutrient intake, and dietary planning that is undertaken before, during and after pregnancy. Nutrition of the fetus begins at conception. For this reason, the nutrition of the mother is important from before conception (probably several months before) as well as throughout pregnancy and breastfeeding.
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.
[10]: 34–47 [65] [66] These late preterm (34 weeks –36 weeks and 6 days) and early term (37 weeks–38 weeks and 6 days) infants are at increased risk for both breastfeeding cessation and complications of insufficient milk intake (e.g., dehydration, hypoglycemia, jaundice, and excessive weight loss). [67]
For example, if there is a gestational age based on the beginning of the last menstrual period of 9.0 weeks, and a first-trimester obstetric ultrasonography gives an estimated gestational age of 10.0 weeks (with a 2 SD variability of ±8% of the estimate, thereby giving a variability of ±0.8 weeks), the difference of 1.0 weeks between the ...
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 .
During pregnancy, pronounced breast growth and maturation occurs in preparation of lactation and breastfeeding. [20] [29] [30] Estrogen and progesterone levels increase dramatically, [20] reaching levels by late pregnancy that are several hundred-fold higher than usual menstrual cycle levels. [31]