The first day of school can be very traumatic for both the parents and the children. The children seem to adjust as soon as the parents have left their side. They see a whole world of advednture in front of them when they share the day with their teacherws and peers. It's very commonfor them to shed some tears at the moment of separation. It is also common for them to shed tears after attending a few days or a couple of weeks. It isn't long before they become adjusted!
Parents Handbook