Sudden Twins

We brought the baby home from the hospital, and just as Sharon was preparing to give him his first feeding, we heard the doorbell.
I opened it.
Three men in environment suits standing there, and a large van parked in the driveway.
“There’s been a mistake,” said one, holding a baby swaddled in a blue cloth. “You had twins.”
Another held a Geiger Counter, watching the dial and sweating. “Hurry up, guys.”
I took the baby… and shut the door.
I looked at the baby.
It glowed orange.
Yes. Orange.
At least we won’t lose him in the dark, right?