How much formula at 9mths

DS currently has 4 x 240ml bottles a day. He generally finishes (at least 200ml) 3 1/2 of them. He's random as to which one doesn't get finished.

As I understand it now he's getting past the 9mth mark he should be going down to 3 bottles. But which one should I drop?

His day goes (approx)
7am bottle, then toast
11:30 am lunch then bottle
4pm bottle
5pm dinner
6:30pm bottle before bed

DD is 9 months and has 2x200 and 1x250. She may leave bout 50ml in total, so approx 600mls per day.

When she was about 8 months she was having a bottle at 7, 11, 2 and 6. She was getting fussy at the 2pm bottle and after 3 days of this I stopped making it and he bottles were all spead out a bit more...so 8, 12, 6.

At the same time I gave her solids for breakfast before the bottle, that way her bottle was pushed to 8ish, instead of 7.

The 4pm and 630pm bottle seem really close together, so the 4pm would make sence, but he might get a little stroppy if you simply stopped it.

I'd drop the 4pm one and give him afternoon tea to hold out til dinner time. Morgans day is roughly like this:

BF
Breakfast
Morning Tea
Nap
Lunch
BF (or bottle if I'm working that day)
Nap
Afternoon Tea
Dinner
Bottle

If she wakes late then no afternoon tea or just a piece of fruit while I make her dinner.

Ava's just gone down to 3 bottles, she was going 7, 11, 3 and 7, and now goes 9, 2 and 7. You will find it you start giving breakfast before the bottle (like they say to at 8-9 months) the bottles will begin decreasing until one of them is dropped and the others even out.