My sister had 4 pregnancies, the first one was successful, in fact her son is now 5 years old. However, the last 3 pregnancies were not successful. The 3 pregnancies were practically similar, the heartbeat of the fetus just stopped at around 2-3 months gestation. Has it something to do with her weight? cause she is somewhat overweight during the 3 unsuccessful pregnancies compared to the first one, she was really slim. Or something else might be causing it?