We kept everything exactly the same and just let her decide if she wanted as much milk or not. We feed on demand, so bottles are when she's hungry rather that at certain times (but they are generally at predictable times every day, give or take about an hour). The times and amounts didn't change at all until about 9 months, then she stopped wanting her late morning bottle. So we had lunch (solids) first at noon and then she had that bottle after lunch rather than before, which meant the 4pm (ish) bottle was less. Now we're at the point where all bottles are about half of what they were at 6 months and she is almost ready to drop the 4pm bottle completely (we're at 10.5 months). I'm guessing soon we'll be on 3 bottles a day. You just go with what they want, but don't force it. You will end up wasting formula at a point because you'll be making more than they'll want for a bit while you let them decide to drop a bottle, but that's not a big deal. But it doesn't usually happen for awhile yet, so I wouldn't try to rush things. Just keep your milk feeds the same time and amount and offer solids around those. Eventually it will all just fall into place.
