As your little man grows, he's going to go through periods of needing more feeds, and the best way to increase your supply is to feed him more. The more you feed, the more milk you produce.

Formula does take longer to digest and this can have the effect of making him sleep longer, or it could upset his little tummy. A lot of the time, it makes no difference whatsoever.

Unfortunately being unable to self settle doesn't necessarily have to do wtih being hungry, so you may put him on the bottle, and he still wakes during the night. As a mum who sometimes gets a whole night's sleep, and at other times, has to wake 2-4 times a night, I have found the easiest way to get through it is to go with the flow. Babies literally change from month to month.