"Grim news for those who thought achieving equality between the sexes was merely a matter of time: A new study from the University of Maryland has found that young people are less supportive of power-sharing between the genders than they were 20 years ago, at least on the home front. The study looked at nationally representative longitudinal data about high-school seniors as part of a Gender and Millennials Online Symposium from the Council on Contemporary Families and found an increase in those who believed that families were better off if the men were "the achievers outside the home" and the women handled most of the family and domestic duties. In 1994, only 42% of high school seniors agreed with that statement. Twenty years later, that was the majority view at 58%."
https://archive.fo/JDKNJ

"Boys Need Close Relationship with Mom," but effects girls as well..."Securely attached babies and toddlers cry out or become visibly upset when stressed and turn to a caregiver for comfort. They use the parent as a "secure base," a place for emotional repairs and confidence tune-ups before zooming back out to explore the world. This type of coping strategy is optimal for development, psychologists think."
http://www.livescience.com/8156-boys-close-relationship-mom.html

"Official: babies do best with mother... One of the longest and most detailed studies of UK childcare has concluded that young children who are looked after by their mothers do significantly better in developmental tests than those cared for in nurseries, by childminders or relatives."
https://www.theguardian.com/society/2005/oct/02/childrensservices.familyandrelationships

"Bad news for dads: Babies 'should share mother's bed until age three' because it's good for their hearts (http://www.dailymail.co.uk/health/article-2054393/Bad-news-dads-Babies-share-mothers-bed-age-good-hearts.html)" which has the implications of needing the mother to stay at home due to children napping at various times throughout the day.

"Let me submit to you that the need for mother is as strong in a baby as the need for food, and that there is no substitute for a securely attached mother. When he’s tired, hurt, or upset, he needs his mother for comfort and security. True, he doesn’t need Mommy all the time, but when he does, he needs her now. If he scrapes his knee, or gets his feelings hurt, he can’t put his need on hold for two hours until Mommy is home, and the babysitter – or even Daddy – just won’t do as well as if Mommy was there. So, yes, this is what I’m saying: A mother shouldn’t leave her baby for an extended amount of time until about the age of 36 months, when he has developed some concept of time."
http://www.drmomma.org/2010/07/mother-toddler-separation.html?m=1

"Many researchers have found correlations between secure mother-infant attachment and later psychological and social development. Infants who securely attach to their mothers become more self-reliant toddlers and have a better sense of self-esteem, said Alan Sroufe, PhD, an attachment researcher at the Institute of Child Development at the University of Minnesota."

"Buffering stress Secure infant attachment may provide children with a crucial tool for dealing with stress by buffering their physiological reaction to novel or unexpected events, said Megan Gunnar, PhD, of the Institute of Child Development at the University of Minnesota."

"With more children entering daycare, researchers have begun to look beyond mother-infant attachment to primary caregiver attachment, whether it be a mother, father or daycare provider.....In terms of effect, Howes and her colleagues found that in a group of 48 4-year-olds, attachment to a child-care provider better predicted peer interactions than mother-child attachment. Toddlers with secure attachments to teachers were more gregarious and more likely to engage in pretend play with peers; preschoolers were more sociable. Children with insecure teacher attachments were more hostile, aggressive, antisocial and withdrawn."

BUT

"However, secure attachments only occur with 50 percent of caregivers as opposed to 70 percent of mothers. The lower rate of attachment probably reflects the lower quality and closeness of the caregiver relationship, said Howes."

http://www.thelizlibrary.org/liz/APA-Monitor-attachment.html

So, from this we must conclude that if a healthy secure attachment is to be formed in childern, it is in the interest of the child for the mother to be the one to form the secure attachment bond due to a 20% increase compared to other caregivers.

"The latest installment of a long-term study of child care in the United States has found that children who spent more time in center-based settings from birth through school entry have somewhat more problems with aggressive and disobedient behavior through sixth grade than children who spent less time in centers, regardless of the quality of care. However, problem behavior and teacher-child conflicts experienced by children who spent extensive time in other types of child care did not continue beyond first grade."

"The study also found that the quality of parenting that children receive is a far stronger and more consistent predictor of achievement and social functioning than children's experiences in early child care. However the study could not determine whether this was due to genes shared by parents and children or the actual parenting experience."

https://www.sciencedaily.com/releases/2007/03/070326095340.htm

So, parents are better indicators of children's behavior than child care, whether it be through genes or parenting itself.

Traditional Gender Roles make Men and Women Happier:
http://www.sciencedirect.com/science/article/pii/S0191886914003882

Couples who share the housework are more likely to divorce, study finds:
http://www.telegraph.co.uk/news/worldnews/europe/9572187/Couples-who-share-the-housework-are-more-likely-to-divorce-study-finds.html

Stay-at-home mothers are happier than "independent" girls obsessed with career like men:
http://www.dailymail.co.uk/news/article-2381647/Stay-home-mothers-happiest-Women-dont-return-work-suffer-feelings-boredom-worthlessness.html

http://huntergatherer.com/good-reasons-why-polygamy-is-a-bad-idea/

Men and women naturally fall into their gender roles
http://www.heretical.com/wilson/rkibbutz.html