OMG. Poor you. It always seems worse when they're so young.
Just remember while you're busy trying to blame yourself...it wasn't your fault. You did everything you could to save your little Sophie. I am so, so sorry.
I always need to remind myself...the blessing of their presence in our lives, no matter how brief, far outweighs the pain we feel with their loss...even though it sure doesn't seem like it sometimes. Please remember to take comfort in the little friends that are still with you. They need you just as much as ever.........