At least in the world of baboons:
Baby baboons born to outgoing mums who enjoy hanging out with other females are considerably more likely to survive their crucial first year than infants born to less friendly mothers…
And the difference is a big one:
Susan Alberts, at Duke University in North Carolina, and one of the research team was surprised by the significance of sociability. “Eight per cent of infant survival is explained by sociality,” she told New Scientist. That is “striking”, she explains, because “we wouldn’t expect to have a large amount of variation that is deterministic – things that a mother can actually control – it’s amazing.”
Here is the full story. In my family of primates, the wife/mother is definitely the sociable one, at night I like to stay at home and write my blog or read.