DOWNEY — The initial court appearance for a 22-year-old La Mirada middle school substitute teacher accused of exchanging sexually graphic images with a 13-year-old student has been postponed until later this month, officials said.

Taylor Welch, who substituted at Arlie F. Hutchinson Middle School in the Norwalk-La Mirada School District was initially scheduled to be arraigned Thursday in Downey Superior Court, according to county booking records.

After he posted $140,000 bail and was released from jail shortly after his arrest, the hearing was re-scheduled for May 22, court officials said.

At the arraignment, formal charges of lewd acts with a child and exchanging sexually graphic content are expected to be read, and Welch will have an opportunity to enter a plea.

According to sheriff’s investigators, Welch has taught at the school since September. He has taught at no other schools.

He met the alleged victim, a 13-year-old girl, in the classroom, officials said.

Welch and the girl contacted each other on Facebook in December, ultimately exchanging of sexually explicit material, sheriff’s investigators said in a written statement. The pair also was believed to have had inappropriate contact in the classroom after class.

Detectives allege that Welch exchanged sexually graphic photographs, live video feeds and “sexting” messages with the student.