The goal is not to delay the inevitable, but to ritualize the goodbye. Keep it simple Your routine could be as simple as helping your child hang up his coat, reading two books in the reading corner, and then waving goodbye at the door. Or you could decide to watch your child color a picture and take it with you when you depart. The routine can change over time, and eventually you might not even need one. A drop-off routine will not always keep your child from crying, especially at first.
Some children cry for days before they adjust.
Once you have finished the activities in your routine, you may need the teacher's reassuring arms to help your child as you leave. Helping children with separation is a large part of a preschool teacher's job. Often the teacher is more effective at calming down your child after the dreaded goodbye has passed. Believe your child's teacher when she says that your little one only cried for ten minutes or so. But ask her to let you know if she is consistently unable to calm your child.