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  2. Voice change - Wikipedia

    en.wikipedia.org/wiki/Voice_change

    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 ...

  3. Prenatal perception - Wikipedia

    en.wikipedia.org/wiki/Prenatal_perception

    Electroencephalography indicates that the capacity for functional pain perception in premature infants does not exist before 29 or 30 weeks; a 2005 meta-analysis states that withdrawal reflexes and changes of heart rates and hormone levels in response to invasive procedures are reflexes that do not indicate fetal pain.

  4. Timeline of human prenatal development - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_human_prenatal...

    Gestational age is the time that has passed since the onset of the last menstruation, which generally or as standard occurs 2 weeks before the actual fertilization. Embryonic age, in contrast measures the actual age of the embryo or fetus from the time of fertilization. Nevertheless, menstruation has historically been the only means of ...

  5. Signs and symptoms of pregnancy - Wikipedia

    en.wikipedia.org/.../Signs_and_symptoms_of_pregnancy

    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. [1]

  6. Parental brain - Wikipedia

    en.wikipedia.org/wiki/Parental_brain

    The amygadala, prefrontal cortex and hypothalamus begin to change during pregnancy due to the high levels of stress experienced by the mother during this time. [ 35 ] In human mothers there was a correlation between increased gray matter volume in the substantia nigra and positive emotional feelings towards the infant.

  7. Maternal physiological changes in pregnancy - Wikipedia

    en.wikipedia.org/wiki/Maternal_physiological...

    There are many physiologic changes that occur during pregnancy that influence respiratory status and function. Progesterone has noticeable effects on respiratory physiology, increasing minute volume (the amount of air breathed in and out of the lungs in 1 minute) by 40% in the first trimester via an increase in tidal volume alone, as the ...

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  9. Prenatal development - Wikipedia

    en.wikipedia.org/wiki/Prenatal_development

    Cannabis use during pregnancy was unrelated to risk of perinatal death or need for special care, but, the babies of women who used cannabis at least once per week before and throughout pregnancy were 216g lighter than those of non‐users, had significantly shorter birth lengths and smaller head circumferences.

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