Between 3 and 6 mo , the OR for SIEs was sensitive to the timing of breastfeeding status , i.e. , 4.3 ( 95 % CI : 1.2 , 15.3 ; P = 0.02 ) when defined at end of monthly intervals and 2.0 ( 95 % CI : 0.8 , 5.0 ; P = 0.13 ) when defined at the beginning of intervals .