The study was carried out on 299 couples in the reproductive age. Objective: Analysis some factors related to the rate of the third child or more in 2 remote mountainous communes in Vo Nhai distric, Thai Nguyen province. Research Methodology: Analysis of related factors, using the X2 test, OR (Odd Ratio). Results: The number of couples of reproductive age in two communes studies is 19.9 percent. High poverty rate (46.1 percent). The households with three or more children accounted for 12 percent
sex ratio at birth 154 newborn sons per 100 newborn girls. Having rather tight correlation between a number of factors with the third child or more, including: economic factors with p 0.05
OR