http://www.care.com/ internet service providing searchable database of caregivers and sitters. Click on "special needs" at bottom of page. Parent with multiple children may need extra help with potty training. Some caregivers have potty training experience.
www.sittercity.com internet service providing searchable database of sitters, nannies, and tutors. Can narrow search for special needs and autism experience. Parents with multiple children may need extra help with potty training. Some caregivers have potty training experience.
http://www.ctac1.com/ Central Texas Autism Center. Therapy session 1-3 hours long. TOILET TRAINING SERVICES and classes for parents.
http://www.mayoclinic.com/health/encopresis/DS00885 discussion of encopresis or "stool witholding." Children with constipation, emotional disturbance, or anxiety issues may suffer from this. Child's developmental age must be four or older for a diagnosis of encopresis.
http://www.abledev.com/encopre.htm more on encopresis, where the child deposits stools somewhere other than the potty and is developmentally over age 4.