EDWARDSVILLE, Ill. (KMOX) – (UPDATED 5 a.m.)  More information about the missing 13-year-old from Edwardsville and her newborn.

Katherine Derleth has a congenital heart defect and a pacemaker, and needs medical care. She is believed to be with her stepfather, 39-year-old Christopher Derleth, and her infant son, Christopher.

The Madison County Sheriff’s Department says they could be hiding out at camp sights around the country and possibly sleeping in the stepfather’s car – a green 1997 Mercury Villager SUV. They were last seen in Virginia.

Our previous reporting is as follows:

There’s new information about a missing Madison County 13-year-old and her young child.

Christopher Derleth, 39, has now been charged in connection with the disappearance of his step-daughter, Katherine Derleth, and her infant son, Christopher.

“We have also obtained arrest warrants for Mr. Derleth on Class X felonies of aggravated kidnapping, and a Class 4 felony of child abduction,” says Capt. Mike Dixon, spokesman for Madison County Sheriff’s Department.

Dixon says there are growing concerns about the health of the teen and her son.

It’s believed the step-father may have abducted the two and is heading to West Virginia in a green older-model Mercury Villager SUV.

According to WSAZ Channel 3, the vehicle was last seen near the MacCorkle Avenue exit in the Kanawha City area of Charleston, West Virginia.

Our previous reporting is as follows:

Illinois State Police say a 13-year-old Edwardsville teen and her two-week-old baby are missing and may be headed to West Virginia.

Police issued an endangered missing person advisory Sunday afternoon for Katherine Elizabeth Derleth and Christopher Ray Derleth.

screen shot 2016 09 19 at 3 27 29 pm UPDATED: Missing 13 Year Old Has Heart Defect

They may be traveling in a green Mercury Villager minivan with Illinois plates E833210.

Police think they could be traveling with Katherine’s step-father: 39-year-old Christopher M. Derleth, described as a 6’1″ 160-pound white male with brown hair and hazel eyes.

(Courtesy of Madison County Sheriff's Office)

(Courtesy of Madison County Sheriff’s Office)

Katherine Derleth is described as a 4’8″ 95-pound white female with brown eyes and brown hair. She has three birthmarks on her right knee.

Contact the Madison County Sheriff’s Department if you see the Derleths or the vehicle.

(TM and Copyright 2016 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2016 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)

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