Can I keep my baby in the car with me when babywearing?

No. The sling does not replace an approved carrying device adapted to the age and weight of the baby for transport in a car. The knots and the fabric are not adapted to offer an adequate restraint in case of deceleration. (Even for a short journey and even at very low speed, as the activation of the airbags and the tensioning of the seat belts represents a great danger).

So you need to switch from babywearing to car seats to protect baby. Here is a video to help you: