In between diaper sizes

Is

My baby seems to be in between sizes, size 3 looks a bit small to him and size 4 is a bit big and also he doesn't weigh the amount the size 4 suggests yet (he's some hundred grams away so it's not by much). Do I go up a size or down? I've tried both and size 3 doesn't hold for nights when he pee a lot, but size 4 I have to wrap the diaper "flaps" around him almost because he's a "thin" baby.

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