Infants born to mothers on the DASH diet had significantly lower weight ( 3222.7 vs 3818.8 g , P < 0.0001 ) , head circumference ( 34.2 vs 35.1 cm , P = 0.01 ) and ponderal index ( 2.50 vs 2.87 kg/m ( 3 ) , P < 0.0001 ) compared with those born to mothers on the control diet .