Role of prenatal characteristics and early growth on pubertal attainment of British girls.
OBJECTIVE
The objective of this study was to explore the influence of maternal prenatal characteristics and behaviors and of weight and BMI gain during early childhood on the timing of various puberty outcomes in girls who were enrolled in the Avon Longitudinal Study of Parents and Children.


METHODS
Repeated self-assessments of pubertal development were obtained from approximately 4000 girls between the ages of 8 and 14. Data on prenatal characteristics and weight at birth and 2, 9, and 20 months of age were obtained from questionnaires, birth records, and clinic visits. Infants' weights were converted to weight-for-age and BMI SD scores (SDSs; z scores), and change values were obtained for the 0- to 20-month and other intervals within that age range. We used parametric survival models to estimate associations with age of entry into Tanner stages of breast and pubic hair and menarche.


RESULTS
Maternal initiation of menarche at age<12, smoking during pregnancy, and primiparity were associated with earlier puberty. A 1-unit increase in the weight SDS change values for the 0- to 20-month age interval was associated with earlier ages of entry into pubertal outcomes (0.19-0.31 years). Increases in the BMI SDS change values were also associated with earlier entry into pubertal outcomes (0.07-0.11 years).


CONCLUSIONS
Many of the maternal prenatal characteristics and weight and BMI gain during infancy seemed to have similar influences across different puberty outcomes. Either such early factors have comparable influences on each of the hormonal processes involved in puberty, or processes are linked and awakening of 1 aspect triggers the others.
Maisonet
Mildred
M
National Center for Environmental Health, Centers for Disease Control and Prevention, 1518 Clifton Road NE, Atlanta, GA 30322, USA. mmaison@sph.emory.edu
Christensen
Krista Yorita
KY
Rubin
Carol
C
Holmes
Adrianne
A
Flanders
W Dana
WD
Heron
Jon
J
Ong
Ken K
KK
Golding
Jean
J
McGeehin
Michael A
MA
Marcus
Michele
M
D000293:Adolescent; D000367:Age Factors; D015992:Body Mass Index; D001835:Body Weight; D002648:Child; D002657:Child Development / Q000502:physiology*; D005260:Female; D047109:Fetal Development; D006128:Growth / Q000502:physiology*; D006801:Humans; D011247:Pregnancy; D011627:Puberty / Q000502:physiology*; D006113:United Kingdom