In Roblox Adopt me, Baby Even walks to the adoption shop to adopt a baby but adult then he walks to adopt me centre to meet. So, The manager tells Baby Even that there is one more left who never adopted by anyone is Slender. Slender is an tall adult but he's a baby & sitting in the crib

Slender : sucks his thumb in his own mouth & open his own diaper then take a peek his own bottom then babble

The manager : There is one left baby adult