Mrs. Barth is a new parent with a​ 6-month-old daughter, Madison. Madison is being seen for a​ 6-month well-child checkup. Mrs. Barth tells the nurse that she is concerned that​ Madison's height and weight are less than those of her​ neighbor's 6-month-old baby. Madison is in the top half of the fifth percentile for weight and height on the standard growth chart. Mrs. Barth is describing the​ baby's eating patterns and behavior. Which characteristic would the nurse recognize as a symptom of the feeding disorder called failure to thrive​ (FTT)?
"Sometimes her bowel movements are​ liquid."

​"She often refuses a bottle and is difficult to​ comfort.
​
"She burps a lot after each​ feeding."

​"She is such a good sleeper. She can sleep six hours straight at​ night."