Sadly no. This baby Kangaskhan isn't its own pokemon(but I wish it was). This is Kangaskhan's "Mega Evolution" with the baby all grown up and standing beside its mother so it can attack twice. Game Freak was being so cheap with this one, seriously. XP
I know its the mega evolution of Kangaskhan, I was just saying that I hope if they make an actually Babykhan as its own pkmn then mega evolved it shows what the baby will become on its own... unless it holds a rare bone.