Relative to control caregivers , intervention caregivers at 6 months were less likely to score > 9 on the Edinburgh Postnatal Depression Scale ( 7.9 % , vs 12.9 % , adjusted odds ratio [ OR ] 0.57 , 95 % confidence interval [ CI ] 0.34 to 0.94 ) , spend > 20 minutes attending infant wakings ( 41 % vs 51 % , adjusted OR 0.66 , 95 % CI 0.46 to 0.95 ) , or change formula ( 13 % vs 23 % , P < .05 ) .