09/06/2025
Sometimes I am asked about child spacing, and while this is going to be a very personal individual decision for each family, I love to chat about the history of child spacing and breastfeeding throughout time. Understanding how our ancestors naturally spaced their children offers fascinating insights into the wisdom of our bodies and the importance of allowing full recovery between pregnancies.
Research by psychology professor Darcia Narvaez and other scholars studying hunter-gatherer societies reveals that for most of human history—the 99% of our species’ existence before agriculture—women typically had only 4-5 children throughout their entire reproductive years, with natural spacing of 3-4 years between births. This wasn’t family planning as we know it today, but rather the natural result of extended breastfeeding patterns and attachment parenting.
In small-band hunter-gatherer communities, children would have grown up with few siblings, surrounded by playmates of various ages, making sibling rivalry less of an issue and allowing for lengthier breastfeeding with an average age of weaning of four years. Archaeological evidence shows that hunter-gatherers like the Gainj of highland Papua New Guinea had an average of 43 months between births, with Pennington calculating 39 months for hunter-gatherers overall.
What made this natural spacing possible was the continuous, intimate care that characterized hunter-gatherer child-rearing. Narvaez’s research on humanity’s “evolved developmental niche” shows that traditional societies practiced nearly constant carrying, extensive positive touch, prompt response to babies’ needs, and infant-initiated breastfeeding for several years. There were no bottles, pacifiers, or scheduled feedings—just responsive, on-demand nursing.
This pattern of extended breastfeeding wasn’t unique to hunter-gatherers. In biblical times, children would have been nursed for several years, with ancient Hebrews completing weaning at about three years of age. According to Jewish rabbinical traditions, weaning could take place anywhere between 18 months and 5 years of age. The celebration of Isaac’s weaning in Genesis 21:8 with a great feast indicates this was considered a significant milestone.
The 3-5 year spacing allowed for something crucial that modern fertility patterns often don’t provide: complete physiological recovery between pregnancies. Research shows that breastfeeding length is positively related to the development of children’s inhibitory control and conscience development in 3-5 year olds. Maternal social support, which was facilitated by this natural child spacing, positively correlated with child cooperation, social competence, and reduced aggressive behavior.
This extended spacing allowed for:
- Full restoration of nutrient stores, particularly iron, folate, and calcium
- Complete healing of reproductive tissues and restoration of core strength
- Hormonal rebalancing and return to optimal fertility
- Emotional and mental restoration from the intensive early parenting period
- Each child receiving intensive, individualized attention during their most crucial developmental years
This intensive caregiving in the early years wasn’t just about nutrition—it was about optimal brain development. Warm, responsive caregiving keeps the infant’s brain calm during the years it is forming its personality and response to the world. The constant physical closeness, immediate response to needs, and extended breastfeeding relationship created the neurobiological foundation for empathy, cooperation, and emotional regulation.
The wisdom of our ancestors reminds us that intensive, responsive caregiving in the early years—including extended breastfeeding that naturally spaces children—isn’t spoiling or indulgence. It’s providing the foundation for optimal physical, emotional, and neurological development that serves children throughout their lives.