Hello,
You may want to talk to your pediatrician about this matter. That said, your infant will be partly protected from many pathogens by your immune cells that have been passed to the fetus through the placenta. This will help the infant for a short period of time. However, I would just be sensible. Keep the baby away from individuals who are sick.
Best regards,
Dr. Downing
You should be fine taking your newborn out. I took mine out in February when she was born. Just make sure your precious little baby is dressed warm and you keep the wind off by covering him or her up with blankets. One of the best ways to carry from the car to the warmth of a house or building is in the car seat with a blanket on them and one over the car seat to keep the wind off. You should be fine that way. I didnt have any problems with either of my girls in the cold like this. Hope this helps.