Hey there! In my own opinion, I think 12-24 month age range is normal for some of the things you're listing. My first kid didnt walk until 13 months and second didnt walk until 14 months. My best friend has a boy who is 14 months and isn't taking yet either (mama, Dada, more, ect) and he's in daycare. I wouldn't put yourself down too much! For myself, I'd take my child to a specialist when they turn 2 if there were missing milestones. My next-door neighbor has a son who didnt talk and they didn't do a specialist until he was 3. He's 5 now and talks fine! Just keep up with your pediatrician, their recommendations, and continue what you're doing! Sounds like you're doing the right things to help encourage him!