If a newborn under 2 mos of age gets a fever - even a little one - they need a spinal tap and a whole sepsis workup. An argument can be made for NOT exposing your newborn to too many people until they're safely past that 2 month point, to minimize the risk that they'll have to undergo a spinal tap for a garden-variety cold.
Not saying there isn't a risk but have you ever seen or used a Moby wrap? The baby is wrapped so close to you, head facing your chest they aren't "exposed" to anyone else. I nurse in the wrap and changed her diaper in the car. She is exposed to more germs at the Dr office when I take her for well baby visits.
Me: 35 husband:39 Sons 16 and 11 from my first marriage Twins 5 (boy/girl) Daughter 3 Affair bomb 2/27/14 He moved in with ow 3/13/14 OW kicked him out 6/15/14 4/2016 he seeks help for sexual addiction