Picky 16 m/o and now lack of appetite

Hey there! 1st time mom here and my son is 16 months old. He has always been a very picky eater, and I always offer multiple choices including foods that we eat. I always try offering the same foods also to help him get used to them if he seems to not care for it. The part that I am stuck on is now he seems to have very little of an appetite and doesn't seem to want to drink as much milk either. Meals includes bites of each item or being completely uninterested. He won't take a spoon from me either this week. His activity level is normal, always wanting to play, and BMs are fine. Is this a normal stage for young toddlers? I just don't know what to do anymore. I used to resort to pouches if he was being really picky, but he's even snubbed those. Thinking of making an appointment with the pediatrician, but wanted to hear other's experiences.