It's not easy to be a parent. Hear words of encouragement for the fathers.
The second verse cracks me up a little. Call it the Biblical version of "Be careful what you wish for: you just might get it." I also think it's amusing that Zechariah, logically, doubts he and his old wife can manage this, so God renders him unable to speak until the birth of the baby. If he was going to say stupid stuff to God's angels, imagine what he would have said to his pregnant wife and how that would have gone for him! God was probably doing Zechariah a great service, saving him from himself and hormonal wrath.
For an explanation of this Fear Not series, read my first post on the nature of fear.