Birth control Demographic surveys--Egypt Egypt--Population_-Statistics Fertility, Human Fertility, Human--Egypt Health surveys--Egypt Birth control clinics--Utilization--Botswana Birth control--Africa, Sub-Saharan --Statistics Birth control--Botswana Birth control--Nigeria--Statistics Birth control--Research--Developing countries Birth control--Research--Methodology Birth control--Trinidad and Tobago Birth control--Uganda Birth control--Yemen--Statistics Breastfeeding--Brazil Children--Mexico--Mortality Children--Tanzania--Mortality Contraception Contraception--Africa South of the Sahara --statistics Contraception--Research--Methodology Contraception--Trinidad and Tobago Contraceptives Demographic surveys--Nigeria Demographic surveys--Turkey Demographic surveys--Uganda Diarrhea in children Diarrhea in children--Brazil Failures Family demography--Mexico