Genuine question, not intended to goad or cause any offence! 
How do children with additional needs - e.g. autism or anything else that makes communication a bit different - cope when their mothers/sisters etc. cover their faces?
If they're all out in a large group are there ever issues with a child getting lost? Would women who cover their faces consider not covering if it would help a child learn valuable communication skills?
I have autism and I find I need to focus on a nose or an eyebrow to appear to be making eye contact sometimes and I really struggle if people are wearing sunglasses or big hats. I also can't gauge reactions very well unless I can see a whole face clearly and it takes me a few meetings to even recognise someone, so it makes me wonder if there's been any research or if any MN Muslims can give some insight into whether this is an issue and what the advice usually is.