Baby boas are okay to feed every 7-10 days. I start spacing it out to 2 weeks once they are up to weaned/small rats and then 3-5 weeks once on larger food. I don't follow a set schedule though.
Since your little one is only on hopper mice, once a week should be fine and yes, you can keep feeding the appropriate size mouse or switch to similar size rats, either works fine. Hopper mouse is close to rat fuzzy size. Most online suppliers will show a basic weight for the different sizes, so that's good way to judge the various sizes. For feeding boas, I feed something that is no larger than the thickest part of the body and personally err on the smaller size.
I hope this helps a little. Good luck with your new little one!
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