I was 9.5 stone before having kids. Went to 14.5 stone after first baby. Lost a couple of stone and then plateaued for years, feeling sluggish and overweight at 12.5st and a size 14.
A year ago, after my third baby I managed to lose all the extra weight and get back to my pre-prefer weight. It felt great to be slim again and wear different clothes etc. Kept my weight and dress size the same for 2 years with not much trouble.
Just recently I have been slipping back into old habits. Over December and Christmas I put on half a stone so was 10st at the end. Fine, I'll lose it in January I thought - but I didn't. In the last month alone I have put on another half stone so I'm now 10st 7lbs. To be honest my motivation seems to have gone out Of the window and I am snacking on rubbish a lot. My self control is slipping every day.
What can I do to get back into it? If I carry on like this I know I'll soon be 11st and beyond. I really want to nip it in the bud and try to get back to my preferred weight, but nothing is inspiring me at the moment - not my new summer clothes (bought hopefully in my slimmer weight size), special occasions coming up - nothing. 
Any words of encouragement/tips/kick up the backside welcomed!!