Baby only poops standing up. Is this normal?

Ever since my son started to stand up (at around 7 months of age) his favourite poop position has been standing up. He never squats. He stands up and stays extremely still in that position until he passes his stool. He's been doing this since starting solids and standing up. I never once thought any of it until now since he's 11 months old and I just looked him asking to myself "why do you only poop like that?"

His poop consistency is healthy and poops nearly every day or every other day, so I have never been concerned for any constipation. So that leaves me pondering if we teach kids to poop sitting down?