Final answer:
Babies can start distinguishing parent terms like 'mommy' and 'daddy' from an early age, recognizing their mother's voice and showing attachment to her. By around 6 months, they can begin making sounds like 'mama' or 'dada' and may use these terms to refer to their parents.
Step-by-step explanation:
Research suggests that babies can start distinguishing parent terms like 'mommy' and 'daddy' even before they are born. Newborns recognize their mother's voice and show preferences for her language. By around 6 months of age, babies will begin making two-syllable sounds like 'mama' or 'dada' and may start using these terms to refer to their parents. They can also distinguish their mother's scent from others and show attachment and anxiety when separated from their parents.