Toddler zones out

Anyone else have a toddler that seems to zone out for a few seconds? No, it’s not a seizure or anything. Her pediatrician says it’s nothing to worry about. She’s 15 months old, is really bright and has been doing this since she was able to hold her attention on something. It’s like she’s in deep thought and then snaps out of it. Just wondering if anyone else’s baby does the same?