Not literally at the same time, of course...
NBS guidance says that you can donate if your baby is over 9 months old, but doesn't mention breastfeeding. Just thought I'd ask here before I get in touch with them.
I was thinking of going in September when my son will be 10 months old. I've been EBF and am now doing BLW so he doesn't eat a huge amount in the way of solids, though maybe he will be having a bit less milk by then.