What if a little one asks about a NAPKIN?

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Sometimes my little brother (10) asks "what is napkin? what is the use of it? What does the(about napkin) advertisement mean? Whenever he asks my mom just ignores his questions. He asks questions whenever he sees a napkin or an advertisement.and aslo when we girls don't fast or pray because of mensus time. whenever he asks I feel so awkward.and difficult to answer because he is a little one.never gave a correct answer.He started asking questions when he was 7 or 8.but somedays ago me and my sister talked a bit about it because it's natural and he somewhat understands it. I hope it's a topic we can't avoid it if we have brothers.here mothers never talk about this with his sons.They keep this secretly.so what do you do if your sons or brothers ask about it? Do you tell about it or you just ignore him because you feel awkward or you think this is something secret which is discussed with females only.