Do we really have to start using the Otteroo in the bathtub before transitioning into a pool?

We recommend that you always start using the Otteroo in a bathtub because it is a familiar environment for your baby. Make sure your baby is completely comfortable in the Otteroo before making the transition to the pool. You can always put cooler water in the bath if it is summer time! When you do make the switch, be sure that the pool water is warm enough for your baby, too.