R.S.
Check out "elimination communication" -- it is a whole school of thought that even young babies can hold their pee if they want to and many babies actually do not like to soil their nest so to speak. According to their research most babies do not pee while they are in a deep sleep-- they are peeing during the in between times of their sleep cycles. Maybe your baby is just sleeping very well? Check out the book Diaper Free Baby for a lot more information. It is not about coercive early potty training-- just about trying to communicate and understand babies' bodies. Congratulations on your little one!