The general mathematical rule is 150mL per kg per day - then just divide that amount up in to how many feeds she has per day... We found Sam was pretty much always below what was recommended on the formula tin, but always pretty much right by the way the hospital calculated it.
Personally, I think it's formula companies trying to get you to waste formula so they sell more...
When it comes to teats, which ones are you using? Signs that she needs a faster or different teat will be if she's collapsing the teat while she sucks. With the standard hospital teats, Sam would do this all the time and the poor little boy would suck and suck and suck and get nothing because it was collapsed... He just needed a different one then. When he needed a faster one, we'd often hear a kind of clicking sound, and you'd see a great gush of bubbles going back into the bottle when he released it. We use avent teats and find that Sam also runs below the recommended ages on the teats - we don't change him because he's hit the magic age, we change him when he shows signs of needing a faster teat.
We are using Avent teats (the 0m+) and yes I have noticed the bubbles coming up in the bottle when she sucks accompanied by a sort of sqeaky whining noise from the bottle.
After a terrible day of whinging and snacking she took 80ml at 3pm then 100ml at 8:30pm!
The squeaky noise is ok. We get that when Sam's sucking hard. You'll know the click when you hear it. If you are really worried about the teat being slow, you could always try her with a faster teat for one feed and see how she goes. We would get terrible refluxy problems if we changed Sam too soon - a lady in a pharmacy explained it as if they don't suck hard enough, a little valve doesn't open and let the milk into their stomach and it just pools...
You're doing a great job! Generally, when she's consistently finishing her bottles would be the time to offer more.
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