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  2. Calendar-based contraceptive methods - Wikipedia

    en.wikipedia.org/wiki/Calendar-based...

    This system was a main form of birth control available to Catholic couples for several decades, until the popularization of symptoms-based fertility awareness methods. A new development in calendar-based methods occurred in 2002, when Georgetown University introduced the Standard Days Method. The Standard Days Method is promoted in conjunction ...

  3. Estradiol-containing birth control pill - Wikipedia

    en.wikipedia.org/wiki/Estradiol-containing_birth...

    The risk of VTE with estradiol/nomegestrol acetate birth control pills is under study. [11] Incidence of irregular vaginal bleeding may be higher with estradiol-containing birth control pills in relation to the fact that estradiol is a weaker estrogen than ethinylestradiol in the endometrium. [3]

  4. "Double bagging", the practice of using two condoms at once, is not an extra-effective method of birth control; instead such use is more likely to cause condom breakage due to friction between the condoms. [381] It is not possible to get pregnant from semen released in a commercial swimming pool without penetration.

  5. Birth control - Wikipedia

    en.wikipedia.org/wiki/Birth_control

    Birth control, also known as contraception, anticonception, and fertility control, is the use of methods or devices to prevent pregnancy. [1] [2] Birth control has been used since ancient times, but effective and safe methods of birth control only became available in the 20th century. [3]

  6. Infant visual development - Wikipedia

    en.wikipedia.org/wiki/Infant_visual_development

    The aspects of human vision which develop following birth include visual acuity, tracking, color perception, depth perception, and object recognition. Unlike many other sensory systems, the human visual system – components from the eye to neural circuits – develops largely after birth, especially in the first few years of life. At birth ...

  7. Retinopathy of prematurity - Wikipedia

    en.wikipedia.org/wiki/Retinopathy_of_prematurity

    Retinopathy of Prematurity or ROP is a retinal vascular disease that affects premature and low birth weight infants. The lower the birth weight the greater the risk of developing ROP. Supplemental oxygenation and the lighting in neonatal units have also been linked to the development of ROP.

  8. Eye development - Wikipedia

    en.wikipedia.org/wiki/Eye_development

    Several layers such as the neural tube, neural crest, surface ectoderm, and mesoderm contribute to the development of the eye. [2] [3] [4] Eye development is initiated by the master control gene PAX6, a homeobox gene with known homologues in humans (aniridia), mice (small eye), and Drosophila (eyeless). The PAX6 gene locus is a transcription ...

  9. Obstetric ultrasonography - Wikipedia

    en.wikipedia.org/wiki/Obstetric_ultrasonography

    Obstetric sonography is useful in the assessment of the cervix in women at risk for premature birth. A short cervix preterm is associated with a higher risk for premature delivery: At 24 weeks' gestation, a cervix length of less than 25 mm defines a risk group for spontaneous preterm birth. Further, the shorter the cervix, the greater the risk ...