Is it important for a 6 month old go to bed early?

My baby has always liked going to sleep for the night around 9:30 pm. I read that babies should be in bed by 7:30 pm. When I let her go to sleep at 9:30 she sleeps 10 hours straight. If I put her to bed any earlier she is up at 10pm, 12am and 3am.

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