It is important that parents do an emotional job and feel confident about where they are leaving their children and of course that they will be fine. Since children go to school to learn, to grow up, to be happy and transmit that security to their children.
Children are afraid that they will not say goodbye to them when they leave it in the classroom, because they are afraid of separating from their parents and if they distract them and then leave without saying goodbye they can get nervous. They need to explain to them that they are coming back soon and with whom they are going to leave and another thing that scares them very much to be one of the last ones when they are going to look for them. That is why the time of departure is extremely important.