THE SITUATIONS OF GIVING BIRTH MORE THAN TWICE OF MARRIED WOMEN 15-49 YEARS OLD AT PHU BINH DISTRICT IN THAI NGUYEN PROVINCE Background: The five years ago, Population and Family Planning (PFP) practices in Phu Binh district of Thai Nguyen province has been carried out very well. However, in the past few years, the district's rate of giving birth more than twice has increased rapidly, having the highest rate compared to other districts and cities in the province. Objective: To describe the situations of more-than-two-child birth of married women aged between 15 and 49 years in the studied area. Methodology: Descriptive study, crosssectional study design conducted with 530 research subjects who are married women aged between 15 and 49 years in Phu Binh district. Results: It shows that the rate of more-than-two-child birth of the research subjects is 28.3%. The age of giving birth more than twice of the respondents between 30 and 35 years old accounted for the highest rate of 62.0%. 35.3% of cases of giving birth more than twice when has the first two children are girls. The two main reasons for having birth more than twice of the respondents take the desire of crowded family as a reason (44.7%) and the desire to have both boys and girls (40.7%). Up to 92.7% of couples decide to have birth more than twice. 35.3% of husbands put pressure on having birth more than twice. Conclusion: The rate of giving birth to the third child or more of the study subjects accounted for a high rate. The main reason for having a third child or more is the desire to have many children and to have both sons and daughters. The main decision in having the 3rd child or more comes from both spouses of the study subjects.