I can't get my 3 months olds to take any treats! I did see one of them try some yogurt a month ago, but was the only time. I've tried corn on the cob, strawberries, cantelope, and honeydew melon. I've tried to get them to take it from my hand or off the ground in their run. They just look at it curiously and walk away! Any ideas on what I can do to get them to try it? Thanks!