Reducing the "transition from the first child to the second" in Iranian families Population Monitoring Center of the country: until 2005, about 82 percent of the children born as a first child in 2015 had siblings. At the time, this ratio was more than 80% in other districts of the country, except for the four districts of Gilan, Tehran, Alborz and Isfaya. This index reached 62% in 1405 compared to 82% in 1385. Currently, the first-to-second child transition ratio in Sistan and Balochistan is 88%.

Reducing the "transition from the first child to the second" in Iranian families Population Monitoring Center of the country: until 2005, about 82 percent of the children born as a first child in 2015 had siblings. At the time, this ratio was more than 80% in other districts of the country, except for the four districts of Gilan, Tehran, Alborz and Isfaya. This index reached 62% in 1405 compared to 82% in 1385. Currently, the first-to-second child transition ratio in Sistan and Balochistan is 88%.