You poor thing Laurab. Have you had a chat with DP yet? Perhaps you could talk about it and reach a compromise?

Have you thought about when YOU would ideally like to have your son move to his own bed? haha maybe never, they are pretty cuddly! But if you were thinking maybe around one for instance, perhaps you could say that you'll revisit the situation at 6 months, making no promises either way IYKWIM?

At any rate, good luck!