adding units to measurements

[Stevenv24]

Hello, my wife and I have been using this for about a week, and we love it. Thank you for your hard work in making a great program that helps parents keep up.

Is there a way to add units of measurement to the measurements?

[cdubz]

See #689 for discussion around this. The lack of units is intentional, but I am more open to it now than I have been in the past (see #689 (comment)) -- just haven't had any time to spend really looking at it.