My wife and I have used this app for our toddler and 9 month old for the last 6 months - and will continue to until both children are on regular nap schedules and consistently sleeping through the night. It is very useful for tracking sleep especially as you try to sync nap times over time and to ensure children have enough but not too much sleep during naps to facilitate sleeping through the night.
Syncing between my wife and my app works most of the time but frustratingly ( every day or two) they dont sync properly requiring manual data correction.
Also, the tracked stats are odd. We would love running average sleep in last 7, 14, 31 days. The data charts disappear after 30 days so there is no way to track long term trends. We take a screen shot at the end of each month to track this. Wish it could show how many hours napped in a day and track that over time.
While there is lots of room for improvement, this is an indispensable app for ensuring our children get proper sleep. Wish we knew about it for our first child. I recommend this app.
...Dale about Sprout Baby Sleep Tracker, v2.3