Thanks for sharing guys it is helpful to hear about what other people have done.

With regards to weight my boy has had no problem putting on weight. His problem is that he can't seem to get enough milk to meet his demands. The Lactation consultant we saw when I was in hospital said he would feed more when he was having a growth spurt but he has been growing at a rapid rate since birth. He was 9 , 12 at birth (4440 kg) as has put on the 10% he lost plus more since then.

I though I would use the formula as a top up after a 15 -20 min breast feed late at night just so he gets that extra sense of feeling 'full'. I only want to use 1 bottle at night for that purpose and thought I could express in order to keep my milk up if need be. Im just at the point were I need more sleep. I wake up feeling as though I have had no sleep. It's really exhausting.