Every week, we take a picture of Margaret in the same rocking chair with an owl pillow I sewed and her owl blankie. We thought it'd be a cool way of tracking her growth. As she gets older and her growth slows down, we'll probably switch to every month or so. Unfortunately, I didn't think to start doing this until her three week birthday. Ah, well.
If you happened to notice that "baby got back" around six weeks, that'd be because we switched to cloth diapers around that time.