My 18 month old DD does this thing where she totally spaces out for from three to twenty seconds and I don't know what it is. I somehow assumed this was just a quirk but my mother pointed out that DD won't even blink if you wave your hand in front of her face while she does this. After my mom pointed this out, I watched more closely and saw that my daughter's fingers often twitch while this is going on. I am sure this is not happening while she is peeing. When it's over, she goes instantly back to what she was doing (usually eating).
Is this just a weird toddler thing that everyone's kids are doing or should I be worried about absence seizures?