Will I get paid for overtime? prescription naprosyn 500mg The research found that the lower the income of a family, the lower the birth weight of a baby. Yet once the child is born, the risk of obesity jumps. By the age of three, the risk is 75% higher for children who are in the bottom 50% of the income distribution. Children in the bottom 20% are 230% more likely to be obese by three years of age.