DS napped until around age 3. DD1, who is 3 (Today!

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: ), stopped napping on a regular basis around 19 months, when her sister was born. I tried to tandem nurse, couldn't handle it, weaned, and that was the end of daily naps. She'll still nap in the car sometimes, but she's a little fireball and can go on and on even when she's completely exhausted. She goes to bed around 7 though, and sleeps 12 hours. DD3, 17 months, is, thankfully, still napping daily.