The question is off-topic, but what can I do so my husband doesn't get sick?

The question is off-topic, but what can I do so my husband doesn't get sick? Every month he gets sick twice ? I'm already tired of this, it's just unbearable seriously. It seems like he just recovered, and here he is again. There's no fever, runny nose and cough + hoarseness. He dresses warmly, sleeps normally, eats normally. I don't know anymore, and I gave him vitamins. Honestly, I'm in the mood to kill on such days. Now that the baby is going to be born, I don't even know what will happen, I say go to your parents' house so we don't get infected, you'll get better and