Oh man. We just recently had our first and this is so frustrating. So much parenting advice is old wives tales and just so stories. I found people like Emily Oster really helpful for this, and the APA guidelines are generally pretty helpful. But there are so many things where the available research is just bad.

Ours sleeps quite a bit more than the average and at first it really concerned us until we talked to our pediatrician and they were like no that falls within the normal range. As an analyst I found it really frustrating that the distributions don't get published.