This article investigates the relationships that exist between women age at first birth and
knowledge of family planning methods in Yoruba society, Nigeria. This central objective was
based on the identified and documented benefits associated with the adoption of family
planning devices by women globally. Family planning programmes are integral and central
parts of safe motherhood initiatives and maternal health programmes of the United Nations.
The understanding of interrelationship between women age at first birth and family planning
variables is of direct relevance to health planners and policymakers attempting to control
population variables and encourage safe motherhood in Yoruba society. To achieve the central
objective of the study, quantitative data were generated from 1,000 women in one of the six
Yoruba speaking States in Nigeria: Osun State. A multi-stage random sampling technique was
adopted to select the respondents, while simple percentages and chi-square statistical method
of analysis were adopted to analyze generated data. Findings of the study show significant
relationships between women age at first birth and family planning variables at P<0.01.
Specially, adolescent mothers exhibit significant low level of knowledge, ever use and current
use of family planning methods compared with older mothers. On the basis of the findings, it
has been recommended that State governments, local and international non-state actors
working on safe motherhood in Yoruba society need to reach adolescent mothers
in-and-outside health institutions through community health workers with contraceptive
methods messages and services in order to improve maternal health and reduce high
population growth rate in Yoruba society