Responding to name- see description

I have some concerns about my 16m old son not responding to his name. My paediatrician has said to keep an eye on it for now to monitor. But I have no idea what is normal for this age. How often does your LO respond to your name if you call it either across the room or sitting close/next to them? Do you have to call multiple times? Do they often appear to just be starring and don’t respond? Thanks!

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