As a parent of 3 boys ages 17, 10, and 5 all on the spectrum (moderate to high functioning autism), this thread saddens me, and I haven't even read all of the responses.
First, I want to say that I have not used a DVD player for any of my boys in a public dining room. But what if I wanted to? It would definitely keep them calm(er). You'd probably not notice them if I did use one because they'd be so quiet. However, expect to possibly hear a scream or a shreak coming from our table. My older 2 do fairly well, but DS5 still has routine meltdowns due to anxiety and sensory related issues. He may have a rough time our first night in the dining room, but our second time back in same dining room could be a wonderful experience. Should we just resume to not exposing him to cruising or eating in the dining room? Autism is not "seen" by the naked eye. My kids all look "normal". For the most part, you'd probably think my 5 year old is just a brat whose not getting his way. So, how will you know if my kid is special needs or not just by looking at him? Who are you to determine if he's "worthy" of the DVD player or not?
Next time you see a child 'misbehaving' or hear a child screaming please stop and think 'could that child have special needs or sensory issues?'. Please spare a thought for the child who struggles to stay calm and regulated and for the parents who are constantly stared at, judged, and criticized.
It would mean a lot to me and every other parent of a child that is difficult, sensitive, non-compliant, odd, hyper, aggressive, or has some sort of diagnosis for these spirited traits, if you would be slow to judge. What we, as parents of special needs children, need is understanding because we judge ourselves enough for all of you.
To the OP, do what is best for YOU and YOUR child, YOUR family. You know what is best for your kids, and what you need to do to keep them and those around you happy.
I do my best as a parent to keep things in "order" as much as possible. Not only for my family, but those around us. I will do my best to make things enjoyable for those sitting around us, but please...If it means me resorting to methods you may not choose (such as a DVD, ipad, etc), don't judge me. Being the parent of 3 special needs boys, and a neuro-typical teen daughter, I'm just trying to keep my head above water most days as it is. So, if it means dinner with a DVD player so us and you can enjoy your dinner......Let it be.

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Elizabeth