Hi there. I'm new to the whole bottle feeding/formula feeding thing too, after weaning DS2 at 10 weeks. He is now 15 weeks old, but 10 weeks corrected. I have been reading your thread with interest and am glad that you're finding some success with the Haberman bottles. I'm by no means an expert, like I said am just a novice myself, but it seems to me your DS is doing okay with respect to his fluid intake. I understand your concern over some of the smaller bottles he's consuming, but if you added up all those mls over a 24 hour period, you might be surprised as to how much he's actually getting. My DS is also like yours and takes fairly smallish amounts during the day. I am so frustrated with all that formula he's leaving in his bottles going down the sink! He is on a 4 hour EASY - his A time is an hour and then he's generally down for 3, so I know the formula is filling him up enough for good daytime naps. He goes down for the night anywhere between 6 and 6.30 (can't stretch him out any longer than this) and will wake at about midnight for a feed (this is his biggest bottle, about 200 ml) and then go straight back to sleep until about 6.30 a.m. He is quite fussy with his feeding during the day and I think during the night he's obviously more calm and relaxed, hence the good feed. My DS1 was also a very fussy feeder and he was breastfed, so I think it's just the temperament of my little men
Anyway, adding up all those bottles (about 6), DS drinks anywhere from 6 to 800 ml in a 24 hour period. He weighs 6 kilos, so I think that's quite a way under the "recommended" amount of formula. But I think the true test is not how much he's drinking but (1) does he have nice, clear, bright eyes and (2) is he having lots of good, wet nappies? If the answer is yes then maybe your little man is just like mine, not a huge formula drinker.