Announcement riddle/rhyme?

As

So my husband and I are going to announce that we are pregnant, just 5 months after having our first baby 😬. I don’t think they will expect this but we’re telling family and close friends a little early just so they can hear it from us and they don’t get suspicious. If you have any ideas on how to make it better I’d love to hear!

The oldest is 1668,

It’s time to celebrate.

The next is 1251,

Lots of work but tons of fun.

The third is 22,

Hope you’re getting a clue.

The youngest is 6,

The thirds very own sidekick.

???

Hint*-the numbers are weeks

So the numbers are my husbands, mine, my sons and the baby’s age in weeks