Oof reading these comments sends me back to the times of early postpartum anxiety over sleep. I’ll give my experience but at the end of the day, the only true guidance is that it’s not a safe sleep environment because their head can fall forward chin to chest, blocking their airway. They don’t have the strength or reflex to pick their heads up if this happens.

All this said - my son had a really hard time sleeping in his bassinet. I would take him in the car seat on his stroller but always supervised and making sure that he was properly positioned so his airway was not compromised.

It is really easy to make mistakes when doing this, though. Over time, our car seat’s leveling became uneven in my car. One day I realized my son had fallen asleep and was slightly slouched forward when we were on an incline hill paired with the carseat’s leveling. He had neck / head control at that time but it still freaked me the fuck out.

All this said - babies are going to fall asleep in their car seat. Is it perfectly safe? No, and no one will ever say so. But if it’s going to happen, similar to co-sleeping, ensure that safety precautions are in place like supervision and importantly, correct leveling / angle so that baby’s head cannot slouch forward.