Birth of a sibling may decrease risk of obesity

Having a younger sibling before first grade may decrease the risk of a child becoming overweight or obese, suggested a new study published online March 11 in Pediatrics. Rana H. Mosli, PhD, from King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia, noted that children who experienced the birth of a sibling between ages 24 and 36 months or between ages 36 and 54 months had a lower body mass index z-score (BMIz) trajectory and a lower BMIz at first grade compared with children of the same age who did not have a younger sibling (0.27 vs 0.51 [P = 04] and 0.26 vs 0.51 [P = .03], respectively).