Congratulate the parents and greet the new one with these new baby balloons. Please note the Jumbo sizes of these balloons. Also great for party decorations. Mylars will last 3-5 days fully inflated and stay afloat for at least 2 weeks. Our latex is treated with Hi-Float,a non-toxic sealant which coats the inner wall of the balloon and will last for 3 days in ideal conditions.