I have a page where the user selects breakfast, lunch, snack or dinner. I have the words below each button. I cannot seem to figure out what icon I can use to differentiate each. So that the user says "Oh there's breakfast." I had a fork and knife icon for dinner. I used a leaf for a snack. Then I became absolutely stumped.
I would try the noun project for these icons. You can either take inspiration from what you find there or use what you find there as long as you purchase it or give the artist attribution.
These are broad concepts that call up different imagery for different people depending on their cultural background. Who is your audience? Is this also for the daycare project (but on the input side of things... lol)?
I agree with the comment by @DA01, that the distinguishing factor between meals isn't what you eat (which can vary from family to family as well as from culture to culture) but when you eat it. Except for snacks, for which the distinction is how much you eat!
Furthermore, if these icons are part of a large check sheet with many details about the daycare kids' daily lives, you might want a common theme that connects all the meal/food icons at a glance.
These are two possibilities I came up with:
There are limitations to both.
The problem with the analog clock faces is that a lot of people aren't comfortable reading analog clocks at a glance anymore, and that could include your daycare workers. If snacks are at a set time mid-afternoon, you could add a 3-o'clock face to the snack plate (and make dinner more distinctly 6-o'clock), but I think just having the small plate also gets the idea across.
The problem with the initials is that it is language-dependent, so not ideal if the reason you're using icons is because it's a multi-lingual environment. Also, that "S" could mean supper as well as snack -- you should probably just skip the "S" on the snack icon and let the small plate size speak for itself.
But my main suggestion is (a) come up with a common icon that means "meal", and then (b) add details that distinguish which meal.