"Oh please, I knew what these were because I raised twilight and have been in daycares," Celestia said, rolling her eyes.
Unless Twilight had some nighttime issues while in Celestia's care, I don't think Celestia would have knowledge of diapers or pull-ups just from raising Twilight, at least from what we know of in canon.
Unless Twilight had some nighttime issues while in Celestia's care, I don't think Celestia would have knowledge of diapers or pull-ups just from raising Twilight, at least from what we know of in canon.