Fortunately for common sense, ...

Fortunately for common sense, psychological research has shown that babies with more than one attachment are less distressed whenmother leaves to go to work. They are more content and playful in the presence of other adults, meaning that they feel secure with people other than Mother.
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 Sandra Scarr

Quotes from the same author

Current conflicts and guilt about being a woman who is a mother and a person in her own right are a socially defined malaise, notan individual problem.... The conflict is not between being a mother and having a career; it is between nineteenth-century ideas about children and today's ideas about women.
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 Sandra Scarr
Ideas about mothers have swung historically with the roles of women. When women were needed to work the fields or shops, experts claimed that children didn't need them much. Mothers, who might be too soft and sentimental, could even be bad for children's character development. But when men left home during the Industrial Revolution to work elsewhere, women were "needed" at home. The cult of domesticity and motherhood became a virtue that kept women in their place.
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 Sandra Scarr
Not until Freud's writings became popular did descriptions of infants center on relationships with their mothers. The idea that children have feelings of any lasting importance for their development is a very recent invention (or insight if you wish).
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 Sandra Scarr
The time-use studies also show that employed women spend as much time as nonworking women in direct interactions with their children. Employed mothers spend as much time as those at home reading to and playing with their young children, although they do not, of course, spend as much time simply in the same room or house with the children.
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 Sandra Scarr
Given Freudian assumptions about the nature of children and the biological predestination of mothers, it is unthinkable for mothers voluntarily to leave their babies in others' care, without guilt about the baby's well-being and a sense of self-deprivation. Mothers need their babies for their own mental health, and babies need their mothers for their mental health--a reciprocal and symbiotic relationship.
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 Sandra Scarr