BABIES BORN IN WINTER START CRAWLING EARLIER
The season of a baby's
birth influences its motor development during its first year of life, a new
study by University of Haifa researcher's shows. Babies born in the winter
(between December and May) start crawling earlier compared to babies born in
the summer (June-November)
The research was
conducted by Dr. Osnat Atun-Einy of the University's Department of Physical
Therapy and Dr. Dina Cohen, Moran Samuel and Prof. Anat Scher of the Department
of Counseling and Human Development. 47 healthy babies with typical development
patterns where divided them into two groups. The first group comprised
"summer-fall" babies, 16 babies born from June to November, and the
second, "winter-spring" babies, 31 babies born from December to May.
The study consisted of motor observations in the babies' homes when there were
seven months old, and a follow-up session when they began to crawl. Parents
were asked to record the stages in their babies' development before and between
the observations.
The study used the
Alberta Infant Motor Scale (AIMS), an observational assessment with high
reliability, to track the babies' development. The scale relates to four
positions: Prone (on the stomach), supine (on the back), sitting, and standing.
The average age at which the babies started crawling was 31 weeks. But while
the babies born in the winter (who started to crawl in the summer) started to
crawl at an average 30 weeks, those born in the summer (who started to crawl in
the winter) began crawling at an average of 35 weeks, with no differences noted
between the boys or the girls or in the initial style of crawling (belly
crawling or using hands and knees).
The overall AIMS
score was higher for those babies born in the winter, and the score for
movement in the prone position, the scale most meaningful in connection with
crawling was, significantly higher for the babies in the winter group. By
contrast, there was no significant difference in the scores for the supine
position, sitting, or standing between the two groups. According to the
researchers, the findings strengthen the assumption that there is a window of
opportunity for starting to crawl and stress the effect of the season on the
start of crawling.
"The difference
in crawling onset of four weeks constitutes 14 percent of a seven-month-old's
life and is significant," the researchers note. "Documenting the
trend by comparing the results of a standard evaluation scale strengthens the
findings and points to a significant seasonal effect in the Israeli context.
"The geographic
location and the local climate where the study is conducted is important to
understand the findings, they add. A seasonal effect is found in places where
the differences in the home environment between summer and winter are
significant. Studies done in Denver, Colorado and in Osaka, Japan found a
seasonal effect that corresponds with the findings of the Haifa study, but a
study conducted in Alberta, Canada, where winters are long and cold on the one
hand, but the home environment (because of winter heating) is very similar all
year round, the seasonal effect was not observed.
"Although the
winter in Israel is comparatively mild compared to other places in the world,
it turns out that it nonetheless influences the motor development of babies
because of the differences between summer and winter in Israel," the
researchers say. "The season influences the babies' experiences in a
number of ways, including layers of clothing that are worn; the opportunities
babies are given to spend on the floor on their stomachs, and the hours of
activity and daylight. Awareness of the seasonal effect is important so that
parents will give their babies proper movement and development opportunities in
the winter as well," the researchers say.
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