Compare taller and shorter. Compare longer and shorter. Compare heavier and lighter. Compare hotter and colder. In later years we’ll use tools to measure such things.
Taller and Shorter by TenMarks Amazon
K.MD.A.2: Directly compare two objects with a measurable attribute in common, to see which object has "more of"/"less of" the attribute, and describe the difference. For example, directly compare the heights of two children and describe one child as taller/shorter.