dd, after eating small amounts of everything in sight, became fussy around 16m. Ds is just turned one and starting to become a little fussy. I found it useful to have a bank of frozen portions of home-made meals which were familiar which she had (and still has) for lunch.Protein based, so bolognese sauce with pasta stars (soup pasta, cheap and v.quick to cook), bread and butter or fried spuds/mash. Very keen on small gnocchi, I buy from Waitrose and keep in freezer, cook in seconds. Macaroni and cauliflower & broccoli cheese. Chicken, root veg and pearl barley stew. Mash, sausage and beans - ok, not new, but keep organic chipolatas in freezer which are nice and tender for little mouths.
Finger food with dips very popular - raw veg, twiglets, breadsticks, crackers, cold sausages, home-made chips with organic spuds and beef dripping. Dips of sour cream and chives, home-made mayo, ketchup, houmous, mashed avocado. Sweet dips of honey/yogurt/cold custard/pot of petit filou with fresh or dried fruit, or toasted cinnamon and raisin bagel fingers.
Dd was, and still is, like a rake so keen to get extra calories in - home-made banana/apple/carrot cakes, or for a treat home-made choc brownies. Good amount of iron even in choc buttons, so no problem with these in moderation.
Good luck, I spent6m worrying myself sick over dd's small appetite before I chilled and realised she is growing just fine. Appetite goes in waves so look at what they've eaten over a week rather than a day!