September baby still not interested in solids??

Carry
anyone else's kiddo only wanting the boob?? my baby (9/1) has never had a bottle and just recently started drinking water straight from a cup but will not touch solids! I tried purees homemade and store bought.. tried feeding him chewed up food from my mouth or from my plate, and he will take 1 or maybe 2 bites may or may not swallow it but prefer to latch onto the boob and get his meal.. I know most say food is "just for fun before 1 " but his new pediatrician (we just moved, previous pediatrician didnt worry) is saying he should be eating more.. didn't deal with this with my 1st born who's 5years old.. any one else??