I love IB's but I have constant problems with elastic in them so personally I wouldn't think that the tutto would last the whole time.

My DD's mediums were starting to lose the elastic after 6 months and I just noticed yesterday that one of her new large size (only 3 months old) is starting to lose elasticity.

I am glad to hear it is a general problem with the IB's - I thought I was doing something seriously wrong! How do you replace the elastic? At this rate there is no way that her large size are going to last another 1-2 years until she is TT!