A recent study conducted on 16,000 Danish children and their mothers and reported that the age at which mothers had their first periods affect the puberty ages of their children. Mothers who developed earlier periods had sons who developed acne, voice-breaking and growing of armpit hair two and two-and-a-half months earlier than the rest while their daughters were found to develop breasts 6months earlier. Dr. Brix says that the study confirms that puberty age of sons is affected by puberty age of their mothers.
He shows this by saying how doctors stress on the importance of family history every time a patient goes to him/her regarding early or delayed onset of puberty. The age when children hit puberty has been decreasing worldwide with the new average ages being 11 for girls and 12 for boys. It was reported that in the UK, the age of reaching puberty for girls and boys have been going down by 1 month every 10 years. Improved nutrition and health maybe reasons for this but link between early onset of puberty and obesity were also found. A 2015 study says that hitting puberty early may put children at greater risks of diabetes, obesity, cardiovascular disease and early menopause.
Early puberty in girls was seen to occur between the ages of 8 and 11 while late puberty begun between the ages of 15 and 19. For boys, between the ages of 9 and 14 they hit normal puberty. An American study also suggests that girls who got hit puberty earlier were at more risks of suffering from mental health issues during their adolescent period and further as they entered adulthood. Dr. Wohlfahrt-Veje of Copenhagen University said that both environmental and genetic factors determine when a child will hit puberty. Both girls and boys, she said, inherit genes from both their parents but further added that girls who start developing pubic hair and breasts earlier than others do so more because of environmental factors like growth patterns among other environmental exposures rather than genetic factors.