Hi Riyengar. I can't recall if it was Randy's Tropicals or IV Tropicals or who on Youtube, but someone there said you need to wait till at least the third leaf before attempting to remove a pup. If you are able to gently remove the soil around it, and you see a few good roots, I'd say your ready to remove one. This is the helpful IV Tropicals video I was thinking of:
https://www.youtube.com/watch?v=ZsPebBgjUnU