 Objective:- To determine the relationship between obesity and early puberty in girls aged 912years.  Hypothesis:- There is no significance relationship between obese girls and early puberty.  Type of Study:- Survey type of school based crosssectional studies carried for a period of 2months.  Sample Size:- 100 samples of school going girls within 9-12 years of age.  Methodology:- Data was collected through a structured Questionnaire, Anthropometric measured were recorded based on which BMI was calculated. Statistical tools like average mean, Standard deviation and one sample t- test were done to draw conclusion. Data was interpreted through tables, pie diagrams, graphs etc.  Results:- A Total of 100 girls were involved, after screening, 60% girls were found to be obese. Out of these 60-sample size it was found that 46.6% obese girls attained early puberty whereas 23% normal and 30% underweight girls hit puberty at an early stage respectively. Critical t-value of +/- 2.051 were obtained; hence the null hypothesis was rejected. From the findings it has been proved that higher percentage of obese girls attained early puberty whereas 30% underweight girls who also reached menarche at early age cannot be overlooked and needs further investigations.Suggestions to prevent obesity and lifestyle management is given to tackle this problem like Vitamin-D supplements, Increased physical activity, healthy eating habits and no stress.So that the age of menarche can be delayed for better health of the young girls in their future life.

Keywords : Anthropometric Measurements, BMI (Body Mass Index), Obesity, Overweight, Underweight,Puberty, Menarche Precocious Puberty.