S.M.
Sounds like my oldest daughter when she was an infant. I think that she sensed my need to protect her and provide her with everything she could possibly need. My second child would go to anyone - probably because I was confident that she'd be okay since now I was "experienced." Some of my most precious memories are those times that I cradled and comforted my oldest daughter - when I was her world. Now she is 14, a freshman in highschool - she'll still come into my room at night to snuggle me up. So - I guess what I'm saying is if you want someone else to put him to sleep and comfort him, let go of any feelings that you can do it best and he'll probably respond. If you can't let that go - enjoy these moments - they are fleeting.
Warmly,
S.