Final answer:
Quinn's spoken vocabulary of 15 words at the age of 1 year aligns with normal language development milestones. One-year-olds typically can speak one- and two-syllable words and have the ability to understand more than they can articulate. Quinn's language development is considered to be on track and will likely expand rapidly in the coming months.
Step-by-step explanation:
Quinn, who just turned 1-year-old and has a spoken vocabulary of 15 words, is exhibiting normal language development milestones for her age. At around 12 months, children typically say their first meaningful words, and by the time they are 2 years old, toddlers use between 50 and 200 words. However, each child may develop at a slightly different pace, so having a vocabulary of 15 words at 1 year of age falls within the expected range of early language acquisition.
One-year-olds like Quinn typically use one- and two-syllable words, such as "ball" and "mama", and can understand several other words along with simple commands. Moreover, gesture usage can be an early predictor of subsequent language development, suggesting that Quinn may soon experience a significant increase in her vocabulary.
Therefore, a true statement about Quinn's language development is that it is on track for her age, incorporating spoken words as well as understanding and using gestures effectively.