Randomized Controlled Trial comparing two education programs with health and singleton pregnant women is run by the Random Allocation Software (Saghaei, 2004). Use the G-Power 3.1.9 windows: repeated measures and between factors among two groups to calculate the number of samples, and setting the power = .8, α = .05, effect size = .25. The estimated number of samples may be lost 20%, total 104 samples ( 52 samples in each group).