THis is so normal at the beginning - one day the are really intrested in shoving stuff in their mouth and the next day absolutly no intrest. Some days you can't get stuff out the fridge quick enough and others you end up with lots of stuff on the floor and nothing in the baby. The main thing if you can relax and follow your baby's lead its great fun - also you will find your tidiness standard lowers - which can only be a good thing!