To feed two in a row you have to do it immediately or it can cause regurge because the stomach acids aren't potent enough after starting to digest the first. Go ahead and wait 5 days, feed the medium, and in 5 more days do a large.
Here is this to help you know when to slow back down to 7 days:
Unfortunately, this doesn't show more underweight than "slim", but if you look at her spine, you will notice how the skin kind of hugs it instead of a gentle slope. She isn't severely emaciated, but certainly underweight.










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