Help!

We did a mix of purees and BLW with Baby X, and until recently he has been a great eater. He was basically done with purees around 8.5 months, and until recently, he'd eat huge quantities of whatever I plopped on his tray. Textures didn't bother him and he would eat anything. But for the last 2.5 weeks, he has become an incredibly picky eater. I'm not sure what to do... I don't want to over-think it, but if this keeps up, I'm worried that he won't be getting the nutrition he needs. I think some of this is related to teething, (his canines are coming in), which we can wait out. But that doesn't seem to be the only thing going on. A lot of the advice I'm seeing applies to older kids, not young toddlers. So how would you deal with a picky one year old?