A first-time father is changing the diaper of his 1-day-old daughter. He asks the nurse, "What is this black, sticky stuff in her diaper?" The nurse's best response is:

"That's meconium, which is your baby's first stool. It's normal.”.

"That's transitional stool.”.

"Oh, don't worry about that. It's okay.”.

"That means your baby is bleeding internally.”.