I picked up some adult mice for my baby ball python today. The store didn't have any rat pups/fuzzies. All mice and rats were in non-see-through packaging and I did my best to measure them with my thumb. The most fitting size seemed to be these adult mice but when I opened them, I wondered if he could actually eat these. I've been told that you feed them by the size of their most widest part. Here are some pictures below to give you an idea of his size and the mice. What do you think? Is it ok to feed him these? I look at his tiny head and wonder if he can do it since he's my first ever snake.

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The last picture was when I first opened the container and he crawled out on his own to my hand. I haven't handled him since (waiting for him to completely settle in) so it's a little difficult to tell how wide his mid section is to my thumb.