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My son has been going to daycare from 6 months, he is almost 3. He goes through periods where he gets really hard to drop off. My husband and I: 1) Reinforce repeatedly when, and which one of us is picking him up. (After lunch, after nap time, ect) 2) Reinforce mommies and daddies always come back. 3)Reinforce we love him, and have a hug/kiss routine. 3)Make sure we always get him by when we told him we are getting him. It goes in waves, but when it gets hard, it is REALLY hard. Hang in there. This too shall pass.