Should a Two-and-a-Half-Month-Old Baby Do This?

My baby is now two months and ten days old, can already lift her head, doesn’t like to lie down, prefers to sit on an adult’s lap, and sometimes can sit by herself for a while. The elders say they have never seen such a small child not lying down and such a small child sitting. Is it okay for such a small child to sit? Will she become a ’little potbelly'?
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