Final answer:
Parents can support language development by engaging in behaviors such as talking to their child, reading books together, and encouraging conversation. On the other hand, using baby talk or not engaging in conversation can hinder language development.
Step-by-step explanation:
Parental input plays an important role in language development. Parents can support language development by engaging in behaviors such as talking to their child, reading books together, and encouraging conversation. These actions provide exposure to language and help children develop vocabulary, grammar, and communication skills.
On the other hand, behaviors like using baby talk or not engaging in conversation with the child can hinder language development.