Poorly people near my baby!!

Claire • Proud mummy to baby Girl ❤️
Can anyone think of a nice way to tell people that if they have a cough or cold NOT to come to my house when my newborn baby is there next month ... People in England think being ill is no big deal and it's different for grown ups anyway. It's dangerous for tiny tiny babies to be poorly but I'm so nice and not confrontational I'm worried I won't be able to say don't come if you're not too well. Also don't want people just calling in every time they pass my house as most live locally ... I will need time almond and time to breastfeed don't want people calling in. How do u say this without being called rude! Due in 4 weeks. Worrying already especially as it will be middle of winter AND Christmas time !!