Not sure what to do

I have a two year old who got a virus from daycare and ended up in hospital for 5 days!!! He got ITP and will have a long road to recovery. Decided to keep him home with me until he is better and until his sister is born. When she is born is it unreasonable that I don't want many visitors, especially those with young children??? My son can't be exposed to any viruses and my daughter will just be born and prone to illnesses. I don't want to be mean but what are my choices ???