Your poor lil DD. We had a similar experience last year when DS started daycare and stopped BFing shortly thereafter. Something like 8 colds/viruses in a six month period. Do go to the doc if you think it's something more though. Maybe her immunity is particularly low and there may be ways to boost it. OJ is good to (vit c). FWIW the second six months of day care was quite a bit better than the first six.