Baby Billy-Bob has a difficult infant temperament. His parents try to be understanding and patient with him, but generally his behavior can be described in terms of? options: moodiness, relative inactivity, and irregularity in daily routine. high levels of activity, but unresponsiveness to changes in routine. negative reactions to changes in routine, irritability, and difficulty being consoled. openness to new experiences, but irregular feeding and sleeping habits. Solution The behaviour can be described in terms of moodiness, relative inactivity, and irregularity in daily routine. Approximately 10% of babies and children have a difficult temperament, which means that they withdraw from or are slow to adapt to new situations, they have intense reactions, they have irregular routines, and they have a negative mood..