Collocations for boy - noun

big
Your boy is big for his age.
Don't cry—you're a big boy now.

little, small
A little boy rode by on a tricycle.
Their boy is small for his age.

young
Our youngest boy is just starting school.

elder, eldest, older
How old is your eldest boy?

baby
five-year-old, etc.
adolescent, teenage
good
Eat up your greens—there's a good boy.

bad, naughty
bright, clever (esp. BrE), smart (esp. AmE)

have
They've had a baby boy.
I have three boys.