have been in the same boat and Olivia is now 6 months and generally takes between 650-800ml a day. during her recent growth spurt this jumped to 1100-1400 :shock: and has started settling back down (yesterday was 880ml). she will have days as low as 650 which stress me out and then she will have 1-2 days of 800-1000 so i guess it really does vary - only my stress rarely changes (i don't know why it is so hard to relax about their eating :? )
we started solids 2 weeks ago and she had no interest at first, then the growth spurt found her desperate for anything and willing to eat loads of solids (3-6TBS) , now we are back at 2-3 tsp.
any dairy counts towards milk as far as i am aware - so as lo takes less milk but takes cow's milk in cooking, yogurt and cheeses this all counts for the day's expected intake. HTH