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I think my LO does, for a baby. She almost never pees during naps, even if they are 2+ hours. Which is sort of a long time for a little baby. She doesn't seem to go a little bit at a time like I think most babies do. She only goes every 2hrs or so, and then quite a bit. Hopefully this foreshadows easy potty training, but too early to tell i'm sure

Yes, she can hold overnight for 12-13 hours.

It seems like they do. I try to make them go though especially in the morning after they wake and before they leave the house. If they're having fun, they can hold it for a long time.