At what point do you decide that you are not going to keep storing away your toddler and baby clothes?

I am just in the process in going through all my stored clothes in preparation for the next baby and I had forgotten how many I actually had. DS is still in a size 2-3 so I am still storing his clothes but I am also still keeping DD's clothes and she is now in a size 6! I think I am now bordering on being silly with hers as really if I had another girl next chances are fashions would change heaps by the time she wore them but I cant bear to throw them out. For some reason I am happy to donate DH's and my clothes (which I do around twice a year) but I can't bear to part with the kids.

Is anyone else like this? And at what point size wise do you go enoughs enough and either throw them away or donate them?