An 18-month-old boy from Mumbai is brought to the pediatric outpatient department because his parents are concerned about his speech. On history, he was born at term, achieved sitting without support at 6 months, and walked independently at 15 months. On examination, he points to objects of interest, understands simple one-step commands ('Give me the toy'), plays with toy cars by rolling them, builds a tower of 2 blocks, and scribbles spontaneously. He says approximately 10–15 words with meaning, including 'mama,' 'papa,' 'ball,' and 'dog.' He does not combine two words yet. His hearing is normal on screening. What is the MOST likely developmental status of this child?