We bought one of the Jane multi-position carseats and have had it in the flat carrycot position across the back seat up until a couple of weeks ago. But now that baby is 6 months old, I thought it was time to convert it into the sitting up position. However whenever he goes to sleep in the car, his neck really droops forward. He looks very uncomfortable. Has anyone else experienced this? Does it occur with other brand stage 0 carseats, as since they are used from newborn, when babies have no neck control, I thought this could be very bad.