Congratulations on the birth of your son.

　　恭喜你们喜得贵子。 (来源：英语论坛 http://bbs.englishcn.com)

　　Congratulations on the arrival of your baby.

　　恭贺小生命的降生。

　　We bid a warm welcome to your new baby.

　　我们热情欢迎你的小宝宝。

　　Warm congratulations on your new baby boy.

　　衷心祝福新诞生的小男孩。

　　We are sending a little gift for your new arrival.

　　我们寄上一份薄礼，给你们新诞生的小宝宝。

　　We can't believe that you are now a father. Congratulations.

　　真不敢相信你做爸爸了。恭喜。

　　We are wishing you joy and wonder and a little sleep.

　　我们愿你快乐、喜悦并且稍作休息。

　　Feeling proud and happy? You have the right to be with you brand?new baby boy.

　　觉得骄傲、快乐吗?有了新的小宝宝，你有权这么做的。

　　I can't wait to see your new son!

　　我等不及要看你的新生儿。