Bub has stopped eating

my 9 month old has always been a really good eater. would eat anything put in front of him. however as of the last few days he has gone from eating nornal to not much to now next to nothing! im not sure whats happening. i originally thought it may have been more teeth coming through (however the firdt couple he never stopped eating) n bcoz i thought that i have gone to purees again but he still isnt wanting anything... any suggestions? what i can try or what/why he may not b wanting foods (fyi he is still drinking his milks fine)