"The womb is an influential first home," says lead author Catherine Monk, director of women's mental health at OB / GYN at New York Presbyterian / Columbia University Irving Medical Center.
"We know that men are more vulnerable in the uterus and probably the stress in these women is longstanding," Monk says.
Nature usually assures that there are an average of 105 boys born for every 100 female births; after all, men are more likely to die from accidents or fight wildlife.
But in this study, women who had higher blood pressure and other signs of physical stress had four boys out of every nine girls (4: 9 ratio); while mothers who were psychologically stressed had two boys every 3 girls (2: 3 ratio). All women had a healthy pregnancy.
"Other researchers have seen this pattern of birth reduction in men associated with traumatic cataclysmic events," Monk says. "One is the assassination of President Kennedy and the other is the September 1
Pregnant women who were physically pressured were also more likely to give birth prematurely than mothers without stress. However, mentally stressed mothers had more complications at birth, such as longer labor, than mothers with physical stress. The Role of Social Support disappeared – a surprising discovery, Monk said.
more surprisingly, the more social support a mother has received, the greater the chance of having a male baby.
"Support can come from family and friends," Monk said. "This may be a sense of belonging to a religious community. It is a sense of social cohesion and social cohesion, which research suggests is a buffer against the experience of stress. That means you're taking a break from it. "
Social support is critical to building confidence in a new mother," said Dr. Christina Penfield, associate professor of fetal maternal medicine at New York University's Langon Medical Center participated in the study.
"Pregnancy is a key moment in women's lives coincide with the redefinition of self, family and community," Penfield said. "It is therefore not surprising that several studies show that when we provide social support programs for pregnant women, we see improvements in their psychosocial outcomes. "
Chronic stress and pregnancy
Until this study examined how shaking can affect pregnancy, others have indicated the role of the stress hormone cortisol
Cortisol is part of the body's "flight or flight" alarm system and aims to dissipate once the danger is over. can increase blood pressure and make a person more susceptible to disease.