“…Of the 32 studies, 9 measured postpartum depression at less than 6 weeks postpartum [ 45 , 47 , 49 , 51 , 59 , 63 , 66 , 94 , 120 ], 12 of them provided data during the six week to 3 month period [ 48 , 49 , 51 , 52 , 54 , 56 , 57 , 63 , 65 , 66 , 67 , 101 ], and 20 studies [ 47 , 51 , 53 , 54 , 58 , 65 , 66 , 69 , 72 , 78 , 83 , 94 , 103 , 104 , 108 , 109 , 110 , 113 , 119 , 123 ] in the three month to one-year period and one study [ 74 ] provided prevalence for the <6 week to 3 month period. Seven of these studies [ 49 , 51 , 53 , 54 , 65 , 66 , 101 ] had a prevalence at more than one point, and two among them [ 51 , …”