I have a 6m old bf and BLW baby. He is awful at night with sleeping and I have been advised by friends whose babies sleep pretty well to give a bottle of formula at night. I still plan to bf through night and day but really want him to start sleeping for longer than 2 hours at a time. I hope by cutting out that feed I will have more milk for night feeds (and hopefully less of them) Does this work and which formula is best and how much in oz?