How come I'm not loosing weight?

Ok I'm on December vacations and I'm sleeping in until 12:00 each day.. then i eat a small ''breakfast'' at like 1:00.. which is usually yougurt, tea, and some fruits and maybe something sweet like an apple sauce or something.. then i dont really eat throughout the whole day until dinner which is something small like pasta or idk.. potatoes :D . anyways. WTF i should atleast be loosin a little weight but im not loosing anything!! i've been like this for a week and i've only lost a teenie weenie bit!1