Being able to turn in and out of a baby on command would be a decent superpower.

Police go to the scene of a crime. That baby couldn't have done it, it's a baby.

Oh you lock me in jail? I morph into a baby. Guard comes around. What's that baby doing in jail? Babies don't belong in jail. Get that baby outta here.

Adults don't fit into strangers' luggage. Babies do. Aruba here I come.

You're trying to rob me? Oh now I'm a creepy demon baby who can talk. Bon appétit.

Oh you caught me demorphing? Good luck having literally anyone believe you. Good luck not getting institutionalized.