Worth it!
One of the few apps I ever spent money on. Has a lot of features, is customizable, and has a well thought-through user interface. I also like the design and that its not kept in the typical light blue/pink of other baby apps. I started with the add supported light version but was annoyed that it only supported a limited number of entries. I would have switched to the full version anyways but lost a full day of data by no longer being able to log.
DR_PI about
Baby Log - Activities, Growth and Milestones, v1.6