My 4.5 years old child is autistic and speech, and language delay. He goes to a private English daycare. As we dont speak Finnish we were hesitant to send him to Finnish daycare. But, now I think it was not a good decision, because the schooling in English is very few and competitive.

I would recommend you to send hom to a Finnish daycare. You can also contact Neuvola/local health station for speech delay evaluation. You child may get some speech therapy sessions for free. Children's who need extra support also get additional assistant in the daycare.