Questions to people from India

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Hi to anyone from India or anyone who has a lot of knowledge of Indians and their customs. First of all I know that in some cases the dot on the forehead indicates marriage. But I have also seen it on children; so what does it mean then? Secondly, I have many Indians in my complex. I notice that the women who dress traditionally always have what I am going to refer to as a scarf. What is the signifigance of that? If there is one. Thirdly, I noticed that often in the case of the couple the man dresses like "Americans"(for lack of a better term); and the woman dresses traditionally. Is there a reason for that? And finally; I have noticed that quite often they shave their infant's heads. What is the reason for that? I am not asking any of these questions to be disrespectful. Please no one take it that way. I am genuinely curious. I love to learn about other people and I know no better way than to ask questions.