I don't think you should be walking down this road until your child's teacher is no longer your child's teacher.
Teachers are usually incredibly nice, empathetic people that are great with children and have a pension plan. That makes teachers quite a catch. So, I think that you should, eventually, try to find out if he likes you. But not right now. That would be very, very weird and could potentially put your child in a really tough place. You'd essentially have to date him in secret to avoid answering questions from your child (if he/she is old enough) or your fellow class mothers.
Give it a year, or two years, or however long it takes before your son or daughter moves on. If you're still carrying the torch then, ask him out. But until then, just let him teach your child.
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