Elles–what an interesting link! A lot of dramatic changes (over time) in many of the foals pictured, but then again there were some Friesians, ponies, and light draft breeds represented 
Your boy is lovely, what a booty on him! That was definitely not an “ugly stage”…Some horses grow different body parts at different stages of development (obviously), but I think the “general rule” is probably pretty accurate, at least when it comes to looking at them at three MONTHS to ascertain general conformation. Some foals haven’t unfolded by 3 days, or are still a little wonky at 3 weeks; so maybe we should just keep looking at the pics of them taken at 3 months, and trust that they will eventually “finish” as a larger and more substantial version of the baby at that age and stage–if we can just remain patient.
I have a picture of my filly taken at her inspection where she looks just lovely (it hangs on the wall, and I’m looking at it right now); she was 2 1/2 months old at the time, so my hope is that the finished product will be just an “age progressed version” of that pretty girl.
Just waiting on those withers…:winkgrin: