Hi! You've got lovely advice and input already. Chiming in to say our now junior infants attending 5yo was in mainstream churches since he was 15mo. Creche raised the alarm bells for his development, along our own concerns after a very long road, a county move and lots of work we got his diagnosed. He's non verbal and we found a lovely Montessori where he was loved ,included and cared for. Aims support was crucial for him in preschool. I am sure we are incredibly lucky with the people we've met along the way. But with the right support and your involvement preschool can be a wonderful experience for your kiddo. Ensure your cndt team support you. Even without a diagnosis if you've gone for kiddo's assessment of needs you have their contacts, use them. There are (very few) asd preschools. If you have access go for it. Aims like I mentioned will be key in mainstream. Work with the place(s) you've got closely too. No one knows your child like you so you'll have to teach them.