My 23 month old DD has been doing bizaare things the last couple of months (or mayeb this is normal for her age??) - some days she'll hold on to wees for hours (like 4-5 hours), and other days she'll wee through everything I put on her including an Itti Bitti AIO Bamboo which would normally hold anything she throws at it!! On a number of occasions she'll totally wet through nappy and clothes 3 or 4 times in one day, then it won't happen for 2-3 weeks, then she'll do it again.
I'm not even sure what I'm hoping to hear form people... maybe just that she's not a complete freak?

I know I can't really do a lot about it because I never know when these days are coming... but perhaps I could have some super-heavy-duty day nappies sitting there for when she does have these days and after the first big wee I can put something "better" on her....? I prefer to use AIOs now, but do I really need to go back to having some fitteds and PUL covers for these times? She's done it twice at day care now (goes one day per week), so I don't REALLY want to send her with a dozen different nappies for "just in case", but also sending 3 changes of clothes is a pain!!
Any suggestions would be greatly appreciated.