3D Pregnancy (Image from gestational age of 6 weeks). Retrieved 2007-08-28. A rotatable 3D version of this photo is available here, and a sketch is available here.
3D Pregnancy (Image from gestational age of 10 weeks). Retrieved 2007-08-28. A rotatable 3D version of this photo is available here, and a sketch is available here.
3D Pregnancy (Image from gestational age of 20 weeks). Retrieved 2007-08-28. A rotatable 3D version of this photo is available here, and a sketch is available here.
3D Pregnancy (Image from gestational age of 40 weeks). Retrieved 2007-08-28. A rotatable 3D version of this photo is available here, and a sketch is available here.
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Chambliss LR; Clark SL (2014). "Paper gestational age wheels are generally inaccurate". Am. J. Obstet. Gynecol. 210 (2): 145.e1–4. doi:10.1016/j.ajog.2013.09.013. PMID24036402.
Jukic AM, Baird DD, Weinberg CR, McConnaughey DR, Wilcox AJ (2013). "Length of human pregnancy and contributors to its natural variation". Hum. Reprod. 28 (10): 2848–55. doi:10.1093/humrep/det297. PMID23922246.
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Tunón K, Eik-Nes SH, Grøttum P, Von Düring V, Kahn JA (2000). "Gestational age in pregnancies conceived after in vitro fertilization: a comparison between age assessed from oocyte retrieval, crown-rump length and biparietal diameter". Ultrasound Obstet Gynecol. 15 (1): 41–6. doi:10.1046/j.1469-0705.2000.00004.x. PMID10776011.
Campbell LA; Klocke RA (April 2001). "Implications for the pregnant patient". American Journal of Respiratory and Critical Care Medicine. 163 (5): 1051–54. doi:10.1164/ajrccm.163.5.16353. PMID11316633.
Dr H. Kieler; O. Axelsson; S. Nilsson; U. Waldenströ (1995). "The length of human pregnancy as calculated by ultrasonographic measurement of the fetal biparietal diameter". Ultrasound in Obstetrics & Gynecology. 6 (5): 353–357. doi:10.1046/j.1469-0705.1995.06050353.x. PMID8590208.
Chambliss LR; Clark SL (2014). "Paper gestational age wheels are generally inaccurate". Am. J. Obstet. Gynecol. 210 (2): 145.e1–4. doi:10.1016/j.ajog.2013.09.013. PMID24036402.
Jukic AM, Baird DD, Weinberg CR, McConnaughey DR, Wilcox AJ (2013). "Length of human pregnancy and contributors to its natural variation". Hum. Reprod. 28 (10): 2848–55. doi:10.1093/humrep/det297. PMID23922246.
Jenkins A, Millar S, Robins J (July 2011). "Denial of pregnancy: a literature review and discussion of ethical and legal issues". Journal of the Royal Society of Medicine. 104 (7): 286–91. doi:10.1258/jrsm.2011.100376. PMID21725094.
Whitworth M, Bricker L, Neilson JP, Dowswell T (Apr 14, 2010). Whitworth M (บ.ก.). "Ultrasound for fetal assessment in early pregnancy". Cochrane database of systematic reviews (Online) (4): CD007058. doi:10.1002/14651858.CD007058.pub2. PMID20393955.
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Stevenson RE, Allen WP, Pai GS, Best R, Seaver LH, Dean J, Thompson S (2000). "Decline in prevalence of neural tube defects in a high-risk region of the United States". Pediatrics. 106 (4): 677–83. doi:10.1542/peds.106.4.677. PMID11015508.
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Berkowitz, K; Garite, T (October 2008). "Postdatism". Welfare of Women Global Health Programme. Global Library of Women's Medicine. doi:10.3843/GLOWM.10123. ISSN1756-2228. สืบค้นเมื่อ 1 August 2021.