I received a dairy from my sister. It's a beautifully leather bound A4 book, with recyled-paper pages, that bind with a piece of twine. I just wrote in that, not much of the pg itself, because it was all plain sailing, but more about the birth and afterwards ... my feelings and fears. So it's not really a "Baby-diary" it's more a mommy-diary.
TBH, I still have to stick some of the u/s pics in the right places.

For this one .... I DON"T KNOW!!! I have not started anything!!!!! I would love to have something, but I am actually terrible at diaries. So something like that pregnancy calender sounds way cool, you just fill in the blanks.
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Goodluck with the writing!!