Afraid of becoming overprotective....

So its 2:45am here and as you can see I'm still up. I thought about my son all day yesterday. I didnt tell my husband I just continued on. But anyways my husband said something to me that got me thinking alot. He said "Baby when God thinks were ready for another child or if we have another child, promise me that you will let me know when and if I become overbearing and too protective of you or the baby." So that got me wondering.... so I figured I should ask you guys. After things like SIDS happen when you have another baby how do you keep from being overprotective of them? I dont want to rob my child of childhood..does this make sense? I know that if Curtis were still alive  I wouldnt be so antsy but at the same time I dont want to feel the need to check the baby every minute of every hour you cant live life like that. So how do you ease your mind?? HELP!!!! Happy 3 month Angel day Chubby Cub!!!  I know you are having a good time up in heaven. Keep watching over mommy and daddy!!! Thanks for sending that beautiful yellow butterfly!!!  You know mommy loved dressing you in yellow....I just thought it was your color!! Well kiss everyone up there for me. I love and miss you Curtis III !!!!