We are fortunate as the place we just bought comes fully equipped with a sliding bolt on our bedroom door! So when she is capable to get out of bed on her own, we can have it locked.

However, we are never really all that extreme in our bondage. And TG always ties it so that usually you only need to pull on one or two ends to get fully untied. He is into slip knots. Not only for the case of having children but also just in case I need to be released for other reasons quickly... like lack of circulation.