I can vaguely remember my 1st born getting "fussier" at this stage but my 2nd born is flat outright refusing to eat anything that isn't toast, plain biscuits or cheese.
Send help as dinnertimes are proving to be a nightmare.
Also - eldest is 6, and gets quite annoyed that usual dinnertime rules (try everything, no throwing food, shouting etc) are not being applied as strongly with younger sibling as we don't/can't force eating. Anyone else had similar and how did you handle it? We've explained age differences and expectations etc but I can see it still gets to them.