{"id":85078,"date":"2012-05-01T22:09:33","date_gmt":"2012-05-02T04:09:33","guid":{"rendered":"https:\/\/americanpregnancy.org\/uncategorized\/first-trimester-of-pregnancy\/"},"modified":"2026-01-29T04:39:46","modified_gmt":"2026-01-29T10:39:46","slug":"first-trimester-fetal-development","status":"publish","type":"post","link":"https:\/\/americanpregnancy.org\/es\/pregnancy\/first-trimester-fetal-development\/","title":{"rendered":"Desarrollo de Su Bebe: Primer Trimestre"},"content":{"rendered":"<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone wp-image-7661 size-full\" title=\"Desarrollo de Su Bebe: Primer Trimestre\" src=\"https:\/\/americanpregnancy.org\/wp-content\/uploads\/2012\/05\/first-trimester.jpg\" alt=\"Feto en el Primer Trimestre del Desarrollo Fetal\" width=\"1000\" height=\"750\" srcset=\"https:\/\/americanpregnancy.org\/wp-content\/uploads\/2012\/05\/first-trimester.jpg 1000w, https:\/\/americanpregnancy.org\/wp-content\/uploads\/2012\/05\/first-trimester-300x225.jpg 300w, https:\/\/americanpregnancy.org\/wp-content\/uploads\/2012\/05\/first-trimester-768x576.jpg 768w, https:\/\/americanpregnancy.org\/wp-content\/uploads\/2012\/05\/first-trimester-150x113.jpg 150w, https:\/\/americanpregnancy.org\/wp-content\/uploads\/2012\/05\/first-trimester-500x375.jpg 500w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<h2>El Primer Trimestre de Embarazo<\/h2>\n<h3>Semanas 1 y 2- Edad Gestacional<\/h3>\n<p>Acaba de terminar su per\u00edodo menstrual, y su cuerpo se est\u00e1 preparando para la <a href=\"https:\/\/americanpregnancy.org\/es\/getting-pregnant\/understanding-ovulation\/\">ovulaci\u00f3n<\/a>. Para la mayor\u00eda de las mujeres, la ovulaci\u00f3n ocurre cerca de 11 a 21 d\u00edas desde el primer d\u00eda del \u00faltimo periodo. Durante sexo, cientos de millones de espermatozoides se liberan en la vagina. Esperma viajar\u00e1 a trav\u00e9s del cuello uterino y en la trompa de Falopio.<br \/>\nSi concepci\u00f3n ocurre, el espermatozoide penetra un \u00f3vulo y crea un conjunto \u00fanico de 46 cromosomas llamada cigoto, que es la base para un nuevo ser humano.\u00a0El \u00f3vulo fertilizado pasa un par de d\u00edas viajando por la trompa de Falopio hacia el \u00fatero, dividiendose en c\u00e9lulas; se llama una m\u00f3rula.\u00a0La m\u00f3rula se convierte en un blastocisto y terminara en el \u00fatero. Despu\u00e9s de 6 a 12 d\u00edas de la concepci\u00f3n, el blastocisto se integra en el forro del \u00fatero y comienza la etapa embrionaria.<\/p>\n<h3>Semana 3- Edad Gestacional (Desarrollo de Su Bebe- Semana 1)<\/h3>\n<p>El embri\u00f3n est\u00e1 pasando por un mont\u00f3n de crecimiento fundamental en este momento, empezando con los pasos primerizos del cerebro, m\u00e9dula espinal, coraz\u00f3n y tracto gastrointestinal.<\/p>\n<h3>Semana 4 y 5- Edad Gestacional (Desarrollo de Su Bebe-Semanas 2 y 3)<\/h3>\n<p>Brotes de brazos y piernas son visibles, pero no claramente distinguibles. El coraz\u00f3n ya late a un ritmo constante. La placenta empienza a formarse y est\u00e1 produciendo algunas hormonas importantes, incluyendo <a href=\"https:\/\/americanpregnancy.org\/es\/while-pregnant\/hcg-levels\/\">hCG<\/a>. Hay movimiento de sangre rudimentaria a trav\u00e9s de los vasos principales. Las primeras estructuras que se convertir\u00e1n en los ojos y los o\u00eddos se est\u00e1n formando. El embri\u00f3n es de \u00bc de pulgada de largo a finales de estas semanas.<\/p>\n<h3>Semana 6 -Edad Gestacional (Desarrollo de Su Bebe- Semana 4)<\/h3>\n<p>La formaci\u00f3n de los pulmones, mand\u00edbula, nariz y paladar comienzan ahora. Los brotes de manos y pies palmeados se convertir\u00e1n en los dedos de manos y pies. El cerebro s\u00e9 sigue formando en sus piezas complejas.\u00a0Un<a href=\"https:\/\/americanpregnancy.org\/es\/prenatal-testing\/ultrasound\/\"> ultrasonido<\/a> vaginal posiblemente podr\u00e1 detectar un latido audible.\u00a0El embri\u00f3n mid\u00e9 acerca de una pulgada y media de largo.<\/p>\n<h3>Semana 7 &#8211; Edad Gestacional (Desarrollo de Su Bebe -Semana 5)<\/h3>\n<p>A las 7 semanas de gestaci\u00f3n, cada \u00f3rgano esencial ha comenzado a formarse en el cuerpo del embri\u00f3n aunque a\u00fan pesa menos que una aspirina. Los fol\u00edculos del pelo, los pezones, los p\u00e1rpados y la lengua han comenzado la formaci\u00f3n. Los codos y los dedos de los pies son m\u00e1s visibles como el tronco empieza a enderezarse.<\/p>\n<h3>Semana 8 &#8211; Edad Gestacional (Desarrollo de Su Bebe -Semana 6)<\/h3>\n<p>Los o\u00eddos se siguen formando externamente e internamente. Todo lo que est\u00e1 presente en un ser humano adulto est\u00e1 ahora presente en el peque\u00f1o embri\u00f3n. Los huesos est\u00e1n empezando a formar , y los m\u00fasculos pueden contraerse. Los rasgos faciales siguen madurando, y los p\u00e1rpados est\u00e1n m\u00e1s desarrollados. El embri\u00f3n se encuentra al final del per\u00edodo embrionario y comienza el per\u00edodo fetal. El embri\u00f3n es de aproximadamente 1 pulgada de largo y es del tama\u00f1o de un grano.<\/p>\n<h3 class=\"floatrt\">Semanas 9 a 13 &#8211; Edad Gestacional (Desarrollo de Su Bebe -Semanas 7 a 11)<\/h3>\n<p>El feto ha crecido cerca de 3 pulgadas de largo y pesa alrededor de una onza. Los genitales se han formado claramente en masculino o femenino , pero a\u00fan no se pueden ver claramente en un ultrasonido. Los p\u00e1rpados se cierran y no se reabrir\u00e1 hasta <a href=\"https:\/\/americanpregnancy.org\/es\/week-by-week\/28-weeks-pregnant\/\">la semana 28 del embarazo<\/a>. El feto puede hacer un pu\u00f1o, y aparecen los brotes de los dientes de leche. La cabeza es casi la mitad del tama\u00f1o de todo el feto.<br \/>\n<strong>Aprenda m\u00e1s sobre los otros Trimestres del Embarazo:<\/strong><\/p>\n<ul>\n<li><a href=\"https:\/\/americanpregnancy.org\/es\/while-pregnant\/second-trimester\/\">Segundo Trimestre<\/a><\/li>\n<li><a href=\"https:\/\/americanpregnancy.org\/es\/while-pregnant\/third-trimester\/\">Tercer Trimestre<\/a><\/li>\n<\/ul>\n<div align=\"right\"><span class=\"mac\">Last Updated: 01\/201<\/span><\/div>\n","protected":false},"excerpt":{"rendered":"<p>El Primer Trimestre de Embarazo Semanas 1 y 2- Edad Gestacional Acaba de terminar su per\u00edodo menstrual, y su cuerpo se est\u00e1 preparando para la ovulaci\u00f3n. Para la mayor\u00eda de las mujeres, la ovulaci\u00f3n ocurre cerca de 11 a 21 d\u00edas desde el primer d\u00eda del \u00faltimo periodo. Durante sexo, cientos de millones de espermatozoides [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":85079,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7629],"tags":[],"faq-categories":[],"class_list":["post-85078","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pregnancy"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.6 (Yoast SEO v28.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>First Trimester of Pregnancy | American Pregnancy Association<\/title>\n<meta name=\"description\" content=\"Fetal development during the first trimester of pregnancy is the most active, including the brain, spine, gastrointestinal tract and heart.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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