Sick all the time!

Is anyone else’s LO always sick? It’s like clockwork, our girl is sick every 3 weeks. She’s in daycare but I thought it would be better by now. I ask the doc every time we are there and they assure me it’s normal for them to be fighting a virus this often but I do worry sometimes. Is anyone else experiencing this? I feel like most the moms I know have family or nannies taking care of their kids, so they aren’t sick as often so It doesn’t feel like anyone understands.