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The earliest fetal response to a sound stimulus has been observed at 16 weeks' gestational age, while the auditory system is fully functional at 25–29 weeks' gestation. [4] At 33–41 weeks' gestation, the fetus is able to distinguish its mother's voice from others. [5] [6]
The embryo upregulates hCG, drives growth of the cell, and upregulates P4 production driving development. hCG and P4 direct changes in the mother to enable successful pregnancy (see below) via upregulation of specific hormones that act to direct both endocrinological and biological changes within the mother for successful pregnancy.
A woman's breasts change during pregnancy to prepare them for breastfeeding a baby. Normal changes include: Tenderness of the nipple or breast; An increase in breast size over the course of the pregnancy; Changes in the color or size of the nipples and areola; More pronounced appearance of Montgomery's tubercles (bumps on the areola)
Most of the voice change begins around puberty. [4] Adult pitch is reached 2–3 years later, but the voice does not stabilize until the ages of 21-25 It usually happens months or years before the development of significant facial hair. Under the influence of sex hormones (namely testosterone), the voice box, or larynx, grows in both sexes ...
Parental experience, as well as changing hormone levels during pregnancy and postpartum, cause changes in the parental brain. [1] Displaying maternal sensitivity towards infant cues, processing those cues and being motivated to engage socially with her infant and attend to the infant's needs in any context could be described as mothering ...
Signs and symptoms of pregnancy are common, benign conditions that result from the changes to the body that occur during pregnancy. Signs and symptoms of pregnancy typically change as pregnancy progresses, although several symptoms may be present throughout. Depending on severity, common symptoms in pregnancy can develop into complications ...
Due date estimation basically follows two steps: Determination of which time point is to be used as the origin for gestational age.This starting point is the woman's last normal menstrual period (LMP) or the corresponding time as estimated by a more accurate method if available.
[1] A hormone secreting structure that develops on the ovary after ovulation. Maternal recognition of pregnancy differs between species, however they all include a signal to prevent luteolysis, which then prevents the resumption of menstrual or oestrous cycles. Luteolysis is the regression of the corpus luteum. The process is identified by the ...
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