Congratulations on the New Born - Greeting 3

There once was a girl,
And that girl met a boy,
They found living as two,
Was a life full of joy.

These two happy lovebird,
This couple, this pair.
Were smug in their nest,
But They thought it quite bare

So they cuddled up closer,
made room in their tree
And their joy overflowed
When two became three.