I love this app. Ive used it since my second child was three days old and shes now 2 months.
Pros:
You can retroactively enter information, which I couldnt find in any other app. This is of utmost importance because it is quite often you forget to enter the information in the frenzy of having a newborn and need to enter it later.
The list of activities (nursing, diaper change, sleeping, and bottle-feeding) is easy to see at a glance, as they make different-colored icons for each activity.
You can make notes in each activity.
Cons:
Although you are supposed to be able to share the app with someone else, it never allowed us to share. My husband is a computer programmer and couldnt figure it out, so I doubt anyone else could.
Although they allow you to log four different activities, it would be nice to have several more such as burping, major milestones (vaccines, etc.), spitting up, and fussiness. That way it would be easier to track behavior and therefore maybe come up with some hypotheses as to what the child needs or what they are going through.
The icons are all similar colors so its hard to detect at a glance what is happening.
Although I really like that they have a trends section, it would be nice if they had an option for the last day as opposed to, or in addition to the last 24 hours.
All in all, I really recommend this app. The cons are not nearly enough to make me not want to use it.