Caitlin has tantrums. Drives me crazy. I have now learned--put her in a cart or stroller when in a store, period! She is very strong willed and will throw herself on the ground at the store and scream her head off! She has tantrums at home too but they don't seem as bad since I can just walk away from her (she follows me screaming sometimes, we have a circle you can walk in our apartment and I just walk her in circles till she stops). I just recently bought the happiest toddler book, hoping it will help!