Is this normal?

My 12mo started infantcare last 3 months. But he keep falling sick since he started. Now is the 5th time within 3 months. High fever mostly and sometimes flu which lasts for a week at least. Because of this, he miss school a lot and is still not used to infantcare. I read that its normal for kids to fall sick easily but isn’t this too frequent? I feel like this is a waste of time & money. might as well just take care of him on my own. He’s already been tested negative for covid btw