2 month old not peeing at night.

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My 2 month old has just started to sleep 7hr stretches. Not every night but a few times now. When she does this her diaper will only have one pee in it in the morning. She is constantly peeing all day she soaks a diaper every 2hrs. Is this normal because she isn't feeding at night anymore? Or is this dehydration? After I feed her in the morning she has a huge pee shortly after.