"Children going into first, sixth or ninth grades often have the most anxiety leading into the new school year because they likely are entering a new school," Larry Tyson, an associate professor in the department of human studies at the University of Alabama at Birmingham, said in a university news release.

"When you are the new kid on the block, not knowing many people can make you self-conscious about how you will fit in. These transition years are big for students figuring out how they will initially fit into this big-school setting," he explained.

Tyson suggest that parents form a partnership with the school counselor.

"Parents should see counselors as child advocates, as their liaison in the school when something isn't working the way it should or they want," he said. "My advice is to not be a stranger; make an appointment once or twice a year, and let the people at the school see and hear from you. You don't have to have your child with you. This will help."

Entering a new school isn't the only cause of stress for children, according to Josh Klapow, an associate professor in the university's School of Public Health.

"New situations that arise during the summer -- changing to a different school system, hitting a growth spurt or experiencing a parental divorce -- all can lead to extra anxiety for a child," he said in the news release.

He offered the following tips to help children adjust:

"Change of any sort can be stressful, so watch your child and be a silent observer," Klapow said. "Give them time to adjust and transition. Recognize that there will be some tough times, but they can be worked through."