Dunno if anybody has tried this but I've been doing it for a few years... Line your nappy with cling film and give it a liberal dousing with baby lotion - the more the better! (or baby oil if you like but i find lotion is better). Put it on and squirm with delight. Have to move the cling film out if the way to wet but it really is something else to squirm front and back in slippery nappy.
Can't stand these new material rather than plastic nappies btw. Lille have been ruined recently by a move to fabric... Back to abri for me!
Anybody got anything similar to try on the squirm front?