I love the idea of a general activity. A notes field and a drop down that would have entries for play time, bath, meds, weight, height, ... A way to track any activity that's not yet a first class citizen.

I would agree. A general activity ('Other' category) will be very useful. It can be used for things like, taking paracetamol or neurofen (which has a set period before the next dose) to bathing to playing to when his last temperature (fever) was. As you know, when babies get a temperature often it's followed by a couple more; comes and goes. This type of information will be useful to record especially if the parent is 'stressing' a bit as their child is sick.

We are not up to the playing stage just yet but being able to add her bath would b excellent! Maybe a notes section is good option.

Thanks for the suggestion! We are considering adding a medicines activity and/or a general notes activity that allows you to add notes for different things like play time.