G.B.
Please go to parentcenter.com and look up choking hazards, or just google choking hazards. Most state child care regulations state that 3 years old is when kids start having less choking and can start fully chewing and swallowing foods like raisins and marshmallows. I know I got lots of odd looks when I would stop and cut up grapes into 1/4 inch pieces, or hot dogs into long skinny slices then in bite size pieces. But I never had a child choke on me once I started doing these things.
As for Peanut Butter, WIC gives it to children after they reach a year or 2 old. I think the later we give kids potentially allergy related foods the better they are off in the long run for allergies.