CFTR and obesity due to melanocortin 4 receptor deficiency: 2. A total of 463 children, of which 28 (6.1%) were in an overweight/obesity condition. The linear regression analysis did not show a statistically significant correlation with the age of introduction of fruit and cereals: coefficient β, respectively = 0.020 (p = 0.743) and 0.011 (p = 0.828).3. Starting CF at 4–6 months (n = 427) or at 6 months (n = 98). There is no difference in the probability of developing overweight/obesity at 3 years (RR = 0.80; 95%IC = 0.51–1.23)