Hi Mukta
I'm glad you had a better night. Roll on those new teeth!
I see what you're saying about your brother but I do believe he shouldn't need to eat at night at his age (I mean your LO not your brother
). If he's a hungry boy then he could squeeze it all in during daytime hours to see him through the night but his body is used to having a good share of his milk at night so it just needs a bit of retraining.
I know you say you've tried the dilluted milk route, what did you do exactly? I would say this; when it becomes clear he doesn't just want his dummy (like at 4.30 this morning), don't do wi/wo but give a bottle straight away, this way he can get back to sleep sooner and is less likely to be overtired (and therefore not eating well!) the next day. After a couple of days give him the same volume in total (4oz?) but only give 3.5 scoops of formula, a couple of days later reduce it to 3 scoops of formula and so on. When he wakes for the day give him as much of his bottle as he'll take and hopefully it will gradually be more. If not don't fret but see it through until he's getting hardly any formula. If he's still not taking his morning milk and is still waking for the bottle and you know it's not the formula he needs at 4am, just the help to get back to sleep, then you can do wi/wo safe in the knowledge that he's not starving.
Another thought, if he's teething that might be preventing him from taking his daytime bottles well. You could try reducing the temperature of his milk a bit and applying some bonjela before feeds.
Kelly x