Microbe and germ loves warm and humid environment, like Hong Kong weather. It is important to keep the baby cot and mattress in a clean and fresh condition. We recommend to always wiping the cot with slightly damp cloth to avoid dust from accumulating onto the surface and gap; use vacuum or slightly damp cloth to wipe the mattress surface, air dry and then put on fitted sheet. It is also good to kill the microbe and germ on mattress under the sun. You shall also pay attention on the ventilation and humidity according to weather changes. During spring time it is humid; while on hot summer, the water vapour remains after turning off the air conditioner are always the time of microbe and germ to multiply the reproduction. It is healthier to keep good ventilation. Use dehumidifier when necessary as the relative humidity is most ideal below 45%.