He is going. He was also the runt of the litter. He's still significantly smaller than his brother whom I'm catsitting today. I'm taking him Monday for a checkup. Maybe they can determine how old he is and we can get started on vaccines and seeing when we can have him nutered.
His name is Felix. He's probably the most laid back kitten I've ever met. His brothers that my in laws have are slightly timid but I think that's because Felix is the only pet in our house and between me, my husband and 3 kids, he gets loads of attention.