<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1665-1146</journal-id>
<journal-title><![CDATA[Boletín médico del Hospital Infantil de México]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Med. Hosp. Infant. Mex.]]></abbrev-journal-title>
<issn>1665-1146</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud, Hospital Infantil de México Federico Gómez]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-11462025000700086</article-id>
<article-id pub-id-type="doi">10.24875/bmhim.24000167</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Effects of 6 months of permanence in an early intervention program on the developmental level of children 18-42 months of age in poverty: cohort study]]></article-title>
<article-title xml:lang="es"><![CDATA[Efectos de seis meses de permanencia en un programa de intervención temprana sobre el nivel de desarrollo de niños de 18-42 meses de edad en situación de pobreza: estudio de cohortes]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villasis-Keever]]></surname>
<given-names><![CDATA[Miguel Á.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Trujillo-Flores]]></surname>
<given-names><![CDATA[Jesús H.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ocaña-Zavaleta]]></surname>
<given-names><![CDATA[Angélica]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortega-Lomelín]]></surname>
<given-names><![CDATA[Perla Ma.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Delaflor-Wagner]]></surname>
<given-names><![CDATA[Christian A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Soto-Briseño]]></surname>
<given-names><![CDATA[Alejandro I.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Trejo]]></surname>
<given-names><![CDATA[Laura A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Aranda]]></surname>
<given-names><![CDATA[José A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aceves-Villagrán]]></surname>
<given-names><![CDATA[Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reyes-Morales]]></surname>
<given-names><![CDATA[Hortensia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rizzoli-Córdoba]]></surname>
<given-names><![CDATA[Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Mexicano del Seguro Social Centro Médico Nacional Siglo XXI Evidence Analysis and Synthesis Research Unit]]></institution>
<addr-line><![CDATA[ Mexico City]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Dirección de primera infancia en la Secretaría de Educación de Nuevo León Dirección de primera infancia en la Secretaría de Educación de Nuevo León ]]></institution>
<addr-line><![CDATA[Monterrey ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Sistema Nacional para el Desarrollo Integral de la Familia Departamento de capacitación de Estancias Infantiles ]]></institution>
<addr-line><![CDATA[ Mexico City]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Coordinación de los Centros de Atención Infantil Desarrollo Integral de la Familia Baja California Coordinación de los Centros de Atención Infantil Desarrollo Integral de la Familia Baja California ]]></institution>
<addr-line><![CDATA[Mexicali ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Instituto de Seguridad Social y Servicios para los Trabajadores del Estado Investigación Biomédica, Centro Médico Nacional 20 de Noviembre ]]></institution>
<addr-line><![CDATA[ Mexico City]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Unidad Médica de Alta Especialidad del Centro Médico Nacional Siglo XXI Unidad de Investigación Médica en Epidemiología Clínica ]]></institution>
<addr-line><![CDATA[ Mexico City]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af7">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Psicología ]]></institution>
<addr-line><![CDATA[ Mexico City]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af8">
<institution><![CDATA[,Hospital Infantil de México Federico Gómez Departamento de Gastroenterología ]]></institution>
<addr-line><![CDATA[ Mexico City]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af9">
<institution><![CDATA[,Centro Nacional para la Atención de la Salud y la Adolescencia Centro Nacional para la Atención de la Salud y la Adolescencia ]]></institution>
<addr-line><![CDATA[ Mexico City]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="A10">
<institution><![CDATA[,Instituto Nacional de Salud Pública Centro de Investigación en Sistemas de Salud ]]></institution>
<addr-line><![CDATA[Cuernavaca ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="A11">
<institution><![CDATA[,Hospital Infantil de México Federico Gómez Servicio de Pediatría del Desarrollo y la Conducta ]]></institution>
<addr-line><![CDATA[ Mexico City]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<volume>82</volume>
<fpage>86</fpage>
<lpage>93</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-11462025000700086&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-11462025000700086&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-11462025000700086&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: The Child Care Facilities Program (PEI, for its Spanish acronym) in Mexico targets parents of children aged 1-3 years living in poverty, providing education and care strategies 5 days a week. This study aimed to evaluate the impact of a 6-month stay in childcare centers on the developmental levels of children under 4 years old.  Methods: A longitudinal, before-and-after study was conducted. Children aged 12-42 months enrolled in the PEI were included in the study. All participants remained in the program for 6 months from the first measurement. The overall and area-specific developmental levels were assessed using the Early Childhood Development Assessment (EDI, for its Spanish acronym) test. The percentages of developmental levels (normal, delayed, and at risk of delay) were compared between the baseline and 6-month assessments using the McNemar test.  Results: The study included 1835 children, of whom 52% were male. The age distribution was as follows: 28.1% were 12-24 months old, 48.4% were 25-36 months old, and 23.5% were 37-42 months old. At baseline, 80.5% (n = 1,476) of the children were classified as having normal overall development, 16% had developmental delay, and 3.5% were at risk for delay. After 6 months, the percentage of children with normal development increased to 90.1%, while those with developmental delay and those at risk for delay decreased to 8.7% and 1.2%, respectively. Similar improvements were observed across various developmental areas, except in the knowledge area.  Conclusions: A 6-month stay in childcare centers is beneficial for improving the developmental levels of children under 4 years old, both overall and in motor, language, social, and cognitive areas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción: El Programa de Estancias Infantiles (PEI) de México se enfoca a padres de niños de 1-3 años de edad en situación de pobreza, e incluye estrategias de educación y cuidado, cinco días a la semana. El objetivo de este estudio evaluar el efecto que permanecer seis meses en el PEI, sobre el nivel de desarrollo de niños menores de cuatro años.  Métodos: Estudio longitudinal y comparativo, de antes y después. Se incluyeron niños y niñas de 12-42 meses inscritos al PEI. Todos los participantes permanecieron en el programa seis meses a partir de la primera medición. El nivel de desarrollo, global y por áreas se evaluó con la prueba Evaluación del Desarrollo Infantil (EDI). Se comparó el porcentaje de nivel de desarrollo (normal, rezago y riesgo de retraso) entre la evaluación basal con la realizada a los seis meses con la prueba McNemar.  Resultados: Se incluyeron 1,835 niños; 52% sexo masculino, el 28.1% de 12-24 meses edad, 48.4% de 25-36 y 23.5% de 37-42. Al inicio, el 80.5% (n = 1,476) se clasificó con desarrollo global normal, el 16% con rezago en el desarrollo y el 3.5% con riesgo de retraso. A los seis meses después, incrementó el porcentaje con desarrollo normal a 90.1%, disminuyendo los otros dos grupos a 8.7% y 1.2%, respectivamente. Por áreas del desarrollo se encontraron resultados similares, con excepción del área de conocimiento.  Conclusiones: La permanencia &lt;6 en el PEI en niños &lt;4 años es favorable para mejorar su nivel de desarrollo, tanto global como por áreas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Child development]]></kwd>
<kwd lng="en"><![CDATA[Childcare centers]]></kwd>
<kwd lng="en"><![CDATA[Educational programs]]></kwd>
<kwd lng="en"><![CDATA[Infants]]></kwd>
<kwd lng="en"><![CDATA[Preschoolers]]></kwd>
<kwd lng="es"><![CDATA[Desarrollo infantil]]></kwd>
<kwd lng="es"><![CDATA[Estancias infantiles]]></kwd>
<kwd lng="es"><![CDATA[Programas educativos]]></kwd>
<kwd lng="es"><![CDATA[Lactantes]]></kwd>
<kwd lng="es"><![CDATA[Preescolares]]></kwd>
</kwd-group>
</article-meta>
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