We've designed a special seat with cover/harness which the infant sits in and contains the fluid.  The infant is seated similar to an infant on a car seat with harness over the pelvis and chest.  The harness prevents infant from slipping down into the fluid.   We've also designed special head gear for infant monitoring devices as O2 and skin tempreture which includes a fluid sensor place on the chin area.  The sensor is linked to device computer system and device will automatically lower fluid level if it senses chin being submerged.