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Human females are joined by only a handful of other animals, including a few long-lived whale species, that have a lengthy life phase when reproduction ends and the time arrives to pitch in with the grandkids. This all-hands (or all flippers) approach to ensuring your genetic legacy apparently pays dividends. A 2019 parsing of preindustrial Finland records suggested that the presence of a maternal grandma between the ages of 50 and 75 made a given grandchild 30 percent more likely to survive early childhood than a kid whose maternal grandmother was deceased. An analysis of 45 historical and contemporary populations showed that the presence of maternal grandmothers can increase child survival rates more even than the presence of biological dads. Orca grannies are similarly clutch, scientists reported recently in the Proceedings of the National Academy of Sciences, with postmenopausal females significantly increasing the chances of their grandcalves’ survival.

Perhaps these big grizzled gals are wise in the ways of Great White shark attacks and other deep-sea child care hacks. In the human case, grandmas most likely also protect their daughters’ physical and mental health, which may in turn help buoy a baby’s survival chances. (Orcas, on the other hand, seem more essential to their 30-something sons, a 2012 report in the journal Science found.)

Human maternal behavior is not just genetically predestined, but also highly responsive to a woman’s social environment. And while new human mothers around the world are renowned for our pluck and adaptability, maternal grandmothers are the rare global constant in our lives, two anthropologists, Brooke Scelza and Katie Hinde, argued in a fascinating 2019 paper in the journal Human Nature.

Indeed, in the United States, where single moms are heading up households in record numbers, Grandma — or Mamie, Yaya, Nanny, Me-maw or Foxy — may be a bigger deal than ever. That innocent-looking older lady, Drs. Scelza and Hinde contend, is a new mother’s secret weapon and often her most crucial source of “social support” — an emotional buffer with physiological heft.

Regardless of their socioeconomic position, women who feel socially supported are less stressed during pregnancies, according to a small but striking 2019 study by researchers at Columbia University and NewYork-Presbyterian, and severe psychological stress is linked to birth complications. Women with support from their own kin have lower rates of postpartum depression, possibly mediated by a more gradual late-pregnancy increase in a chemical called placental corticotropin-releasing hormone, a U.C.L.A. team found.

Mamas’ girls may also go on to have easier births, fewer C-sections and more robust newborns who settle more readily into daily routines. Supported moms also report being less tired postpartum and have better success breastfeeding.

(Somewhat bizarrely, emotionally supported moms may also be more likely to bear grandsons: The Columbia-New York-Presbyterian study suggested that less-stressed women are more likely to deliver boys, presumably because males are notoriously vulnerable to stress-related miscarriage.)

The particulars of supportive post-birth rituals vary across cultures, but maternal grandmas are almost always central. Chinese grandmas braise pigs’ feet with ginger, which may restore calcium to a woman’s depleted bones. Indonesian grandmas brew a special lactation soup. For her two daughters, my mom makes spaghetti and meatballs.

Of course, other relatives can play these roles, and even paid professional attendants can lift mothers’ mental health.

But all caregivers are not created equal. Research on Chinese women found that if somebody else — specifically, a mother-in-law — is braising the pigs’ feet or otherwise tending to postpartum needs during the “sitting the month” tradition of rest, the new mom is twice as likely to get depressed.

The absence of a maternal grandmother creates visceral stress, and a study of Puerto Rican women published in 2011, also by Dr. Scelza in Human Nature, showed that those on shaky terms with their nearby mothers and not relying on them for social support are prone to comparatively worse birth outcomes, with increased odds of lower-weight babies and infant death.

Meanwhile, women who reported having warm mothers when they were children may be more sensitive to their own future babies’ cries and other cues, a group of international researchers found. Neuroimaging suggested that these women had extra gray matter in certain areas of their brains, hinting that the primal mother-daughter relationship may be etched in the architecture of our maternal brains.