My first time away

So tommorow I fly out to my cousins wedding with my son. I am excited, and I KNOW my grandma will be well taken care of, but I cant shake this new mom feeling ! I remember the first time I spent overnight away from my son when he was a toddler, and all the feelings, thought, and fears swarmed my head. " Will he understand why I am gone, and not at home with him, will he be ok with me being gone this long, did I leave all the info for the person watching him, oh did I get out EVERYTHING he needed ? " It whent on, and on so I was rather surprised to find  I am having the exact same feelings with my grandma. It logically makes sense that I would think those things, but its still hard to wrap my mind around feeling them for my 89 year old grandma who changed my diapers at one point. When did this happen ?