These are neotenic traits in humans : flattened face , broadened face , large brain , hairless body , hairless face , small nose , reduction of brow ridge , small teeth , small upper jaw ( maxilla ) , small lower jaw ( mandible ) , thinness of skull bones , limbs proportionately short compared to torso length , longer leg than arm length , larger eyes , and upright stance .
These features of adult humans are different from those of adult great apes , but more similar to those of juvenile apes : These are some of the neotenous traits in humans : flattened face , broadened face , large brain , hairless body , hairless face , small nose , reduction of brow ridge , small teeth , small upper jaw ( maxilla ) , small lower jaw ( mandible ) , thinness of skull bones , limbs proportionately short compared to torso length , longer leg than arm length , larger eyes , and upright stance .