I spent 3 months and over a 50 hours reading and analyzing the orginal sources for the milestones that circulate online (CDC and SLPs one). I found a lot of helpful information and unfortunately, a lot of concerning gaps too!
If you want to hear more about that process, What I think about the CDC milestones that pedis use, what I think about the generic SLP milestones you see online, and why I'm choosing to use these -- Watch the following webinar! It's worth every penny!