Quick calculations make that 7 births in 13 years. In a developing country like Zanzibar this family situation is common. But I do believe the social and economic situation is different. In Zanzibar medical care is not easy to come by. Doctors come as Rotary volunteers providing medical care in the Maternity ward at the hospital.
Malnutrition is prevalent and diseases like malaria, hookworm and tuberculosis are endemic.
You write about NFP and abstinence. I doubt it works everywhere. Compare Adel Hamdy's note on the status of women. This is a serious matter we are dealing with and too much emotion might not be the best just now. You are welcome to contact me directly if you wish.