すえ末sueっこ子ko
1.
The child in a family who is the last to be born among the siblings.
2.
The youngest sibling in a group of brothers and sisters, often characterized by being pampered or doted upon by the family.
3.
The offspring in a family that holds the position of being the most recently added to the lineage, typically associated with unique familial dynamics.
Example:
私は末っ子です。