Looking For Childcare For 4yo Boy

We are looking for an experienced individual to care for our 4yo. He is developmentally delayed so he needs help in different areas than other children his age. He has no behavioral issues and is the most loving and sweet boy. He is not potty trained. He loves being outside! On nice days, we enjoy playing on the playground or walking around our neighborhood. He also likes to play independently in his playroom. He is nonverbal and has difficulty following directions but does an excellent job of making his needs known. We are looking for someone with special needs/ autism experience. Looking for two Sundays a month (8a-4p) and/or occasional Wednesday and Thursday evening. Willing to take someone who could cover some or all of those days. We have a dog, but she's happy to remain in a separate room while we are not home.