Can't believe the time has went by that quickly!! The standard for males (to the top of the shoulder) is 26-28 inches, with 27 1/2 being an average. So he will probably top out a little above since he is just 8 mo. old right now. As for his weight, as long as you can press and feel his ribs, but they aren't obvious noticeable by sight, his weight is probably good as well. Is he a pretty slender boy? Seems like he would be a little heavier at 8 months. But that's not saying he's underweight, it all depends on their body type. Can't weight to see some current pics!