We started ttc when #1 was 9 months as we wanted them close in age. I continued breastfeeding right through the pregnancy and had no issues at all. My boys are 18 months apart and I LOVE having them so close together...they're almost 5 and 3.5 now and great mates DS#1 chose to give up breastfeeding the day after #2 was born. If I had my time again I wouldn't change a thing!