This is double-blind, controlled fiel trial, to compare fortified egg with D3-or 25(OH)D3 and non-fortified eggs in healthy preschool-age children 12 to 60 months of age, affiliated to day-care centers at Secretaria de Desarrollo Social (SEDESOL). The study aims to answer are: 1. to evaluate the efficacy of fortified egg with vitamian D3 on serum concentrations of 25-hydroxyvitamin D3 2. and to evaluate parathyroid hormone (PTH) in children aged 12 to 60 months of age. * Children would be given for breakfast fortified egg/non-foritfied egg three times per week for 12 weeks. * Blood samples will be taken at baseline and at the end of study. * Anthropometric meassurements weight /height will be taken at baseline and at end of study.
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Serum 25-OH-D
Timeframe: At baseline and at 12 weeks of intervention