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Pregnancy Timeline by SemestersFemale Reproductive SystemFertilizationThe Appearance of SomitesFirst TrimesterSecond TrimesterThird TrimesterFetal liver is producing blood cellsHead may position into pelvisBrain convolutions beginFull TermWhite fat begins to be madeWhite fat begins to be madeHead may position into pelvisImmune system beginningImmune system beginningPeriod of rapid brain growthBrain convolutions beginLungs begin to produce surfactantSensory brain waves begin to activateSensory brain waves begin to activateInner Ear Bones HardenBone marrow starts making blood cellsBone marrow starts making blood cellsBrown fat surrounds lymphatic systemFetal sexual organs visibleFinger and toe prints appearFinger and toe prints appearHeartbeat can be detectedHeartbeat can be detectedBasic Brain Structure in PlaceThe Appearance of SomitesFirst Detectable Brain WavesA Four Chambered HeartBeginning Cerebral HemispheresEnd of Embryonic PeriodEnd of Embryonic PeriodFirst Thin Layer of Skin AppearsThird TrimesterDevelopmental Timeline
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October 22, 2012--------News Archive Return to: News Alerts


This new research found that the observed mean ages of stage 2 pubertal onset –
were six months to two years earlier than documented by data several decades earlier.


WHO Child Growth Charts

       

Study Documents Early Puberty Onset in U.S.A. Boys

A study conducted by the American Academy of Pediatrics (AAP) has documented that boys in the U.S. are experiencing the onset of puberty six months to two years earlier than reported in previous research

The study, "Secondary Sexual Characteristics in Boys: Data from the Pediatric Research in Office Settings Network," will be published in the November 2012 Pediatrics and published online Oct. 20 to coincide with the AAP National Conference & Exhibition in New Orleans. The trend toward earlier onset of puberty in girls is now generally accepted and supported by extensive research. Until now, little research was available on the age of onset of puberty in boys in contemporary times.

The study was designed and conducted through the AAP Pediatric Research in Office Settings (PROS) practice-based research network, a system of hundreds of pediatricians nationwide who contribute data to AAP-led scientific studies on children's health. A 1997 PROS study was the first large study to document earlier pubertal onset in US girls. For the study of pubertal characteristics in boys, 212 practitioners in 144 pediatric offices in 41 states recorded information on more than 4,100 boys.

This new research found that the observed mean ages of stage 2 genital and pubic hair growth, and early testicular enlargement – standard indications of pubertal onset – were six months to two years earlier than documented by data several decades earlier.


Pediatricians recorded the earliest stage
of puberty as occurring in non-Hispanic
white boys at age 10.14 years; in non-Hispanic
African-American boys at age 9.14 years,
and in Hispanic boys at age 10.4.

Overall, African-American boys were more
likely to start puberty earlier than white
or Hispanic boys. Study authors say the causes
and public health implications of an apparent
shift toward a lower age of puberty onset for
boys is unclear and warrants further research.


"Contemporary data on the ages of pubertal characteristics in U.S. boys from onset to maturity, lacking until now, are needed by pediatricians, public health scientists, and parents," said study author Marcia E. Herman-Giddens, DrPH. "Following changes in growth and development is an important part of assessing the health of the nation's children. I am grateful to the pediatricians and the boys who participated in this exciting study."

"All parents need to know whether their sons are maturing within the contemporary age range, but, until now, this has not been known for U.S. boys," said PROS Director Richard C. Wasserman, MD, MPH, FAAP. "The PROS study provides 21st century standards."

Dr. Wasserman: "The landmark PROS study of the 1990s provided contemporary data for girls' puberty. A study on boys puberty was a logical follow-up. Our pediatric endocrinologist colleagues now use the PROS puberty assessment training materials in their own studies and fellowship training."

The American Academy of Pediatrics is an organization of 60,000 primary care pediatricians, pediatric medical subspecialists and pediatric surgical specialists dedicated to the health, safety and well-being of infants, children, adolescents and young adults. For more information, visit www.aap.org.

Original article: http://www.aap.org/en-us/about-the-aap/aap-press-room/Pages/AAP-Study-Documents-Early-Puberty-Onset-In-Boys.aspx