Riddle Poem: These four require a detour

Most in our family
Are born whole and quickly.

But not us four
Who require a detour.

We don't want to interrupt
Until the rest is developed.

So until then we wait
To be put into our complete state.

Then everything will make sense
When finished is the sequence.

Who are the "four" that this poem refers to?

Answer

My guess is:

the letters 'i', 't', 'j', and 'x'. Letters you complete after you write a word in cursive (dot your i's and cross your t's!).