I give Ellis 7-8oz before he goes to bed in the evening (little guzzler!!!) well, OH does so I can have a bath, and have been doing so for the last month although it may be EBM if I get a chance to express! It hasn't helped him sleep through, HV said that mainy mums that BF found it made no difference when they switched to FF, just depends on the baby! He has the bottle at 7pm and then usually wakes at 1am, 4am and at 7.30am which I can handle. If OH is off sometimes the 1am feed is a bottle. It has not effected my supply and I guess I have been lucky as Ellis has not been confused. We use Tommy Tippee CTN bottles.