Nap problems

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My son has been doing 1 nap a day like a champ for about a month now, but suddenly it’s SUPER hard to get him to go down! He wakes up between 6-7am, used to nap at 11, but the last couple of days it’s taking until after 2 to get him to sleep (lots of tears and milk in the process 😩). He’s too young to transition to no nap, right???