If I had a kid it would be:
Jump on the bed any time you want, it's only a bed, and you're light, you're little, it's ok for you to jump on it now

Cookies? All the time, whenever you want, I will never shame you for eating too many, you know how many you need, and if you get sick I'll help you without shaming you or gloating, I'll just help, and that way you'll learn not to eat so many cookies

Feelings? We can talk about all the feelings, even the angry ones or the sad ones, and I'll never keep my experience from you, I'm an open book, no nonsense, I've dealt with some bad things in life too, and done some bad things, but I'm ok, and I'm here, with you, and that makes me happy