The analysis of birth intervals explicitly recognizes the distinct
renewable nature of the fertility process. It considers the progression
from one birth to the next during a woman's reproductive life. Birth
spacing among women is affected by several factors and as a result for
some women a birth interval is too short; for some women the interval is
too long; and for other women it is just right. Hence birth intervals
play a major role on childbearing and receive attention in the study of
human fertility. Wider birth interval has several benefits. Longer gap
between births allows a mother more time to recover from pregnancy and
delivery; the next pregnancy and birth are more likely to be at full
conception and growth; there is less competition between existing
children for breastfeeding, food, nutrition, the mother's time, and
other resources. Therefore, Birth Interval analysis undoubtedly provides
useful information on reproduction and family formation.