My Db and I have Ds's of a similar age. I went down the EBF route and my DSil chose to formula feed from the start. My DS has put on weight well since birth but has always woken at night for a feed and still needs feeding every 3 hours or so during the day. I'm not thrilled about the broken sleep, but since he's less than 6 months old I'm happy to carry on and hope that once he's weaned and in his own room his sleep will settle down (or will deal with it later if it doesn't!) I've always been supportive of DSIL's choice to FF and have never criticised the decision even though I don't agree with it - her family have a lot of allergies/eczema and I felt that she should at least give the colostrum even if she felt BFing would be difficult and embarrassing. My issue is that they routinely (smugly) comment on my DS's size ("Are you sure he isn't going to be obese?"), or sleeping patterns ("You've made a rod for your own back with him, my DS sleeps from 7 till 6 each day"). I don't want to give the impression that I'm not happy their son sleeps through the night 
, but if I get one more smug crack about how much better FF is I think I might swing for someone! 