On that topic, I had a friend who had twin girls. They were induced prematurely because one of the twins was getting all the food and starving the other, so when they were little, they were off by ~3 months consistently in development. Now they are older and you can't tell at all, but my friend joked that he when people asked him "oh, are they twins?" he'd answer "No, they are 3-months apart" - just to watch people's heads try to process that. :smile: