olderchild
nounUK /ˌəʊldəˈtʃaɪld/
US /ˌoʊldərˈtʃaɪld/
An older child is a kid who is bigger and not a baby anymore.
The older child helped her little brother tie his shoes.
OTHER MEANINGS
2. The firstborn or eldest child in a family.
As the older child, he always looked after his younger sisters.
3. A child who is no longer a toddler or infant.
The school has classes for older children and separate rooms for babies.
4. A child of greater age compared with another child being discussed.
The older child got to stay up an hour later than the younger one.