Babies whose caregivers use child-directed speech learn language more slowly than babies whose caregivers use adult patterns in their speech.

This statement is false. Babies whose caregivers use child-directed speech actually learn language more quickly than those exposed to adult-directed speech. Child-directed speech is characterized by slower and exaggerated speech patterns, higher pitch, and exaggerated intonation, which are all beneficial in aiding the acquisition of language in infants.