[Your letterhead, if desired; if not, your return address]
[Date of letter-month, day, and year]
[Recipient's first and last names]
[Street or P.O. box address]
[City, State ZIP code]
Dear [recipient's name]:
We are absolutely over the moon in announcing to you the arrival of our first son, William Smith Stone, who was born on February 17th at 5:17 p.m. in Sioux City. A healthy and content baby, he weighed 8 pounds 4 ounces at birth and was 21 inches long. The entire family is doing great and adjusting well.
We will send pictures of our precious new baby sometime this week. Please visit us soon so you can meet William!
[Sender's first and last names]