I timed planting this monstera by seed where it actually sprouted within 2 days of my son being born! It’s been putting out leaves on his month marker so there’s always a new leaf for each new month of his life. I’ve been watching the 5th leaf coming out and today, 4days after his 5month mark, I see this. I had thought this whole time it was solid but not any more! 5months for fenestrations! I don’t know if that’s fast or not but I feel accomplished! Can’t wait to see this thing in its full glory in a week or two from now! Edit: while using ChatGPT to ask what the average time it takes for these to form I found out they’re called incisions, fenestrations are only the holes in the center of the leaf.