Hi,
I had gastro a few weeks ago, and so did my ds. Despite me being on a drip in ahospital for a few hours, we kept bf through it. Ds was so sick, he needed the comfort as well. Just make sure you drink plenty of water, diluted juice or lemonade, or those hydralite iceblocks you get from the chemist (go the apple and blackcurrant rather than the orange) to keep your own fluids up too. Best of luck