Thanks for the quick reply.
As it was tested it probably drew in the milliamps - whatever the Baby-O draws on its own. Even when combined with the elements the PCB is designed to control, it will draw a maximum of 200 mA at less than 6V using one of the motor controllers.
I bought one of your regulators and it works fine with the system. I got the D24V22F9, it allows 2.3A - much more than I need but I like the margin of safety. This will be powered by an automobile "12V" electrical system and thus can provide an input voltage of around 14.5V plus.