It's really important to make sure that she is always offered the breast before a comp feed. Otherwise your supply will suffer, and it will be very difficult to get rid of the comps. If you need to comp three feeds, that's fine, but make sure she has a BF first, and then offer the bottle. So 9 or so BFs, and 3 comp feeds, if that makes sense? I would be more inclined to do 2 or 3 smaller comps, rather than one big one. So you're giving the same amount each day, but in more frequent, smaller feeds.

When using bottles, make sure you use a very slow teat, and try to pace the feed out, to mimic a breastfeed. She doesn't need to guzzle it, you can take more control over the bottle feeds to make sure that doesn't happen. She is still young enough to struggle with nipple confusion, so it's really important to take measures to lessen that.

If you are giving top ups it's a good idea to express, and give the EBM to your DD, instead of formula, if possible. Don't be worried about the amount you express though.

While there may be some variances, it's important to note that young breastfed babies should be pooing at least once a day. Yes, as they get older their poos can become more infrequent, but early on it is a very big indicator of how much milk they're getting.