My thoughts are that perhaps DS is missing his Dad and so is acting up. That's two things he's dealing with - Dad gone and a new bed. I know you put him in the new bed 3 months ago, but the bed is still fairly new to him and with your DH gone it might just be upsetting enough to him - possibly to even think that you might go too so he has to spend as much time with you as possible.

Can I ask if he is actually leaving his room or just getting out of his bed? If he is just getting out of bed then perhaps just leave him to it (make sure his room is toddler prrof!!) and then go and check on him in 15 mins. Then put him back to bed, and leave again. But if he is leaving his room you could either put a child gate on his door to stop him leaving, or perhaps just give up on the idea that you can leave the room. At least while his Dad is gone.

Good luck. We have our second due in May and we have been co-sleeping with DS up until a week ago. We put him in to his toddler bed in our room, to keep the surroundings familiar. So far so good. As for him going in to his own room I will see how we go, but I am happy that he is in his own bed for now.

Mum2MissM - I went and saw Pinky McKay the other night talking about toddler tactics and she mentioned that a (psychologist maybe?) pointed out to her that toddlers often start difficult behaviour 6 months after a major upheaval, traumatic event etc. The reason I mention it is that there were a few people there that had toddlers that were acting up and sure enough each of them had something that was a major event approx 6 months before - one moved house and toddler went from co-sleeping in old house, to new bed in new room in new house. Another one was in and out of hospital with toddler in tow. So is there anything that could have upset your DD approx 6 months ago?