.4. The simulation of Hutterite fertility -- 5. The Effects on Fertility of Breastfeeding and Sexual Abstinence -- 5.1. The … -- 5.4. The simulation of Yoruba fertility -- 6. The Physiological Relationship between Fertility and Infant and Child ….2. Models of the effect on fertility of the use of contraception -- 7.3. The simulation of Yoruba fertility incorporating family …