Tommee Tippee Transition Spout Cups 4M+ 150mlCare Instructions: It is not recommended to use hot water or carbonated drinks. If you use warm water, a small amount of water may leak out. Don't worry, because the water bottle is tightly sealed due to thermal expansion and contraction, which leads to different pressures inside and outside the water bottle, so leakage will naturally occur. Usage tips: shake the cup after filling it with water, use the pressure inside the cup to spray the water out,