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This study examines the association between selected socio-demographic factors (gender, birth order, parents' educational levels, and parents' employment status) and reasons for vaccination delay among Jordanian children under two years of age. A cross-sectional, prospective study was conducted in the three comprehensive public health centres in Amman Governorate in Jordan from January-June, 2019. The electronic vaccination record was designed to collect socio- demographic information and reasons for vaccination delay in children. This d