At Billund Airport you can borrow a stroller, which you can use til you arrive at the gate. Strollers and pushchairs cannot be taken onto the plane at Billund Airport. These must be dropped off at check-in.
However, some companies allow strollers to be picked up by the airplane door at the next destination - even if the flight has several subsequent destinations. Please check whether this is possible on your flight when you check-in. If it is possible the stroller will be marked and handed out at the airplane door at the next destination.
Some airlines allow "umbrella strollers" which, in collapsed condition, comply with the rules for hand luggage or do not fill more than one normal umbrella, can be brought to the plane and stored as hand luggage during the flight.
Read more about protecting your stroller or baby carriage in an AIRSHELL: