I'm losing my mind right now. TW Infant death.

My goddaughter died this morning. She wasn't even 2 months old yet. The gorgeous little girl that was supposed to be my little girls best friend and partner in crime. I'm so close to breaking down right now, and I don't know I'm going to face my friend and her boyfriend (who's practically my brother). I don't know how I'm going to cope with my own daughter come August with this in the back of my mind. I'm a FTM and already scared shitless and this just compounds that. I've never been this close to a situation like this and I don't even know how to react or what to say to her parents. I feel guilty for my first thought being "I hope she wasn't sleeping in her car seat again" when I heard the news. I'm even more scared to have my own child now...I don't know how I'm going to do it.