A nurse assesses 4 children. All of the children are experiencing regression. Which of the following children should the nurse be concerned about?

A 3-year-old child who has experienced gross motor regression for six months.

A 1-year-old child who has been waking frequently during the night crying after moving to a new house one week ago.

A 2-year-old child who has been experiencing regression for two weeks after beginning to attend day care.

A 2-year-old child who has been hospitalized for cellulitis and is having incontinence resulting in diaper use.