does anyone know what causes babies to be breech? I'm just curious because my first baby was heads down most of the time and stayed that way till the end but my second baby was heads up the whole pregnancy and never turned, now baby number 3 is in a heads up transvers possition which he/she's been in since the start. I know they turn and move alot and can stay heads up right till the end but I wondered if there's a reason which causes babies to be breech?