Toddler food

My son choked on a grape while at daycare when he was one so now I freak out feeding my kids still cuz I'm so scared they will choke. There ages are 3 and 20 months. I know I go overboard when it comes to cutting up their food but I cant help it. I even cut their blueberries in half cuz I'd rather be safe then sorry. Is that crazy? Are blueberries ok for them to eat full size? My 3 yr old is the one who choked at the age of one and he's just a little guy. Him and my youngest are only a pound apart so that doesn't help cuz he's just small. Am I being redicilous? I just don't know how to get over this fear of feeding them.