Moving to 1 nap?

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When did you move your child down to 1 nap a day? My daughter turns 1 in a couple weeks and lately she hasn’t been napping in the morning like usual. She use to sleep 7pm to 7am, take a nap around 10am and then again at 2pm. The past 2 weeks she has been skipping her 10am nap and just plays in her crib. Is it a big transition to go down to one nap? I’ve read developmentally 12-18 months is common, but I’d like to get real examples if I can.