I keep a box for each of them.I put name bands and first shoes,newspaper of the day.lots of things i gather up all the cards gift tags etc. I usually keep it going for a while and then pack it away.
Im not sentimental for long,I throw/give away clothes toys equip as soon they grow out of it.
DH is always furious when we have to buy something again that we already had. especially as they are all under 7 and things should still be around.
Its one of our biggest row starters, I cant stop myself though. I cannot lovingly pack away and find somewhere to store boxes of clothes,the cot,door bouncer, bedding or anything like that.
I got away with it this time because we needed girl things but he's so mad about the missing stuff already. He says hes looking in the loft for the highchair,cot and baby bath at the weekend.
They are not up there.