Pixie Wow!!! Congratulations!
Two little princesses to look forward to! :)
shanelle - Men can be arseholes, can't they?!
Firstly, I would be very pissed off if DP had done the same, and you have every right to be a 'hormonal cow' as he puts it!
I wouldn't back down over the clothes, he knew full well you wanted them put away and wether it was an accident or not he should be very sorry for that, as like you said there were 100's of pounds worth in there and now they're gone :( I think he'd feel the same if the shoe was on the other foot.
As for the kids knowing, they were going to find out sooner or later and I think it's unfair of him to have left you out (considering you're the one carrying his child) so he should apologise for that too, but if and when he does, I would just accept it and move on, as that argument could go on forever if you hold a grudge over it, and you have plenty of time to talk to the family about the new arrival by yourself. Don't let it get to you, as if he did do it out of spite, he'll want you to be upset by it and if you're not, it will probably make him realise it was quite a childish way to do it.
That's just the way i'd do it though, and also make sure he includes me in the future.
I do hope you manage to sort things out with him, as it's supposed to be a lovely time for you both to look forward to this baby that you've created together. It can be stressful and there will be arguments, but the sooner you (and the rest of us) can overcome them the better. The stress is not good for you or the baby, or the rest of the brood for that matter!