Why Many Parents Carry Babies around the Left Hip

 

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In scientific terms, the phrase for caregivers carrying their babies on the left hip is called “left-sided bias.” That’s just a fancy way to say that the parent prefers the left side. A study in Nature explained that the left-sided bias in mammals is actually because of the way the brain develops. Well, the right side of the brain controls the left side of the body and the right side of the brain also controls emotions.

So by holding a. Learn the fascinating reason why 70-85% of women hold babies on their left hip by instinct, regardless of their dominant hand. A mother’s instinct is a truly powerful and beautiful thing. When we hold our babies on the left side, the ride side of the parent’s brain is physically activated—it basically lights up like a pinball machine.

This. Previous research has indicated that 70–85 percent of women and girls show a bias to hold infants, or dolls, to the left side of their body. This bias doesn’t only crop up in motherhood either, little girls of preschool age have demonstrated the left carrying bias too. Interestingly, this bias is not matched in males.

Every mom has their “strong arm,” aka, the baby-holding arm. However, most of use the same side to hold our kids — on the left. As it turns out, there’s more than lefty-righty favoring issues at play here, and the urge to choose one side over the other has scientific reasons.

Research tells usthat between 70 and 85 percent of moms prefer holding their baby. Much like ants can carry up to 100 times their weight, in those first few years of a child’s life, each day is like a physical work-out for new super-human mums. Picking up our kids is instinctive. Most left-handed mothers in the study held their babies with their left arms, as well (And, as a lefty myself, I carry my babies with my left arm!). The reason?

Researchers think it’s evolutionary. When moms hoist their children onto their left hips, they are putting their own left eye closest to their offspring’s left eye. Previous research has indicated that 70—85 per cent of women and girls show a bias to hold infants, or dolls, to the left side of their body.

This bias doesn’t only crop up in motherhood either, little girls of preschool age have demonstrated the left carrying bias too. Interestingly, this bias is not matched in males. The Inuit women used a parka called an amauti to carry babies and toddlers.

The baby sits in the back of the parka, and the large hood can be used when needed, going over both of their heads, but still enabling to child to see over the mother’s shoulder. Cradle boards were used by many Native American and Canadian cultures.

List of related literature:

It is thought the left hip is affected more because the fetus is more likely to lie on the left side of the uterus, pushing the left hip against the maternal sacrum and preventing movement of the hip joint.

“Skills for Midwifery Practice Australia & New Zealand edition” by Sara Bayes, Sally-Ann de-Vitry Smith, Robyn Maude
from Skills for Midwifery Practice Australia & New Zealand edition
by Sara Bayes, Sally-Ann de-Vitry Smith, Robyn Maude
Elsevier Health Sciences APAC, 2018

The fact that the fetus more commonly lies with the left side toward the mother’s spine may explain why the left hip is more commonly dislocated than the right.3 Left-sided hip dislocation is noted four times more frequently than right-sided hip dislocation.

“Smith's Recognizable Patterns of Human Deformation” by John M. Graham, Jr. MD, ScD, Pedro A. Sanchez-Lara, MD. MSCE
from Smith’s Recognizable Patterns of Human Deformation
by John M. Graham, Jr. MD, ScD, Pedro A. Sanchez-Lara, MD. MSCE
Elsevier Health Sciences, 2015

The left hip is affected 60% of the time, probably because of pressure on the hip from the mother’s sacrum because most birth presentations are left occiput anterior.

“Pediatric Surgery E-Book” by Arnold G. Coran, Anthony Caldamone, N. Scott Adzick, Thomas M. Krummel, Jean-Martin Laberge, Robert Shamberger
from Pediatric Surgery E-Book
by Arnold G. Coran, Anthony Caldamone, et. al.
Elsevier Health Sciences, 2012

The left hip is more frequently affected, and this is believed to be because the most common intrauterine position leaves the left leg adducted against the lumbar spine.

“Postgraduate Orthopaedics: The Candidate's Guide to the FRCS (Tr & Orth) Examination” by Paul A. Banaszkiewicz, Deiary F. Kader
from Postgraduate Orthopaedics: The Candidate’s Guide to the FRCS (Tr & Orth) Examination
by Paul A. Banaszkiewicz, Deiary F. Kader
Cambridge University Press, 2017

The left hip is affected three times as often as the right hip, possibly because of in utero positioning.

“Nelson Essentials of Pediatrics E-Book” by Karen Marcdante, Robert M. Kliegman
from Nelson Essentials of Pediatrics E-Book
by Karen Marcdante, Robert M. Kliegman
Elsevier Health Sciences, 2018

There is a lower risk for developmental hip dysplasia in cultures in which the infant is carried straddled on the mother’s waist with the infant’s hips flexed and widely abducted.

“Introduction to Maternity and Pediatric Nursing E-Book” by Gloria Leifer
from Introduction to Maternity and Pediatric Nursing E-Book
by Gloria Leifer
Elsevier Health Sciences, 2014

Somehow, mothers intuitively know that it is important to hold their babies on the left side.

“Seeing Through Statistics” by Jessica M. Utts
from Seeing Through Statistics
by Jessica M. Utts
Cengage Learning, 2014

In the newborn the left hip is most often involved because this hip typically is the one in a forced adduction position against the mother’s sacrum.

“Pediatric Primary Care E-Book” by Catherine E. Burns, Ardys M. Dunn, Margaret A. Brady, Nancy Barber Starr, Catherine G. Blosser, Dawn Lee Garzon Maaks
from Pediatric Primary Care E-Book
by Catherine E. Burns, Ardys M. Dunn, et. al.
Elsevier Health Sciences, 2012

The left hip is more frequently affected than the right, possibly because, in breech presentation, the fetus lies with the right shoulder anterior and the left thigh closest to the maternal sacrum.

“Gray's Anatomy E-Book: The Anatomical Basis of Clinical Practice” by Susan Standring
from Gray’s Anatomy E-Book: The Anatomical Basis of Clinical Practice
by Susan Standring
Elsevier Health Sciences, 2015

It has also been observed that the left hip is more commonly involved because it is adducted against the mother’s lumbosacral spine in the most common intra-uterine position.

“Developmental Juvenile Osteology” by Craig Cunningham, Louise Scheuer, Sue Black
from Developmental Juvenile Osteology
by Craig Cunningham, Louise Scheuer, Sue Black
Elsevier Science, 2016

Oktay Kutluk

Kutluk Oktay, MD, FACOG is one of the world's foremost experts in fertility preservation as well as ovarian stimulation and in vitro fertilization for infertility treatments. He developed and performed the world's first ovarian transplantation procedures as well as pioneered new ovarian stimulation protocols for embryo and oocyte freezing for breast and endometrial cancer patients.

Mail: [email protected]
Telephone: +1 (877) 492-3666

Biography: https://medicine.yale.edu/profile/kutluk_oktay/
Bibliography: oktay_bibliography

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