preferred_name: Child is able to maintain head in midline for more than 15 seconds without hands being held.
preferred_name_lc: child is able to maintain head in midline for more than 15 seconds without hands being held.
label: Child is able to maintain head in midline for more than 15 seconds without hands being held.
label_lc: child is able to maintain head in midline for more than 15 seconds without hands being held.