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To introduce the process of setting up the Taiwan Maternal and Child Health Database (TMCHD) and the content of the TMCHD. This project utilized the Taiwan Birth Registration Database (BRD), Birth Certificate Application (BCA), National Register of Death (NRD [2004-2011 for the BRD, BCA, and NRD]), and the National Health Insurance Research Database (NHIRD [1998-2011]) to inter-link the medical claims of offspring and their parents. An effort was also made to restore the medical claims of a parent to his/her newborn; medical claims are usually issued to one of the parent within 60 days after birth. The TMCHD includes the information derived from inpatient/outpatient claims of all infants born between 2004 and 2011, in addition to a number of variables recorded in the BRD, including birthweight, gestational age, and single/multiple births. The variables in the BCA, such as …