外国朋友有孙女了，用英语怎么祝贺她？

Congratulations!
或者 Congratulations on your granddaughter!
前面几个翻的....无语了我

congratulations to you on your granddaughter's born.
祝贺你有孙女了。

***(姓名)，I heard you became grandpa lately.Congratulations!
我听说你最近当了爷爷，祝贺你啊！

Thank you very much

congratulations to you for getting a grandchild!

how nice, that you have a grandchild！ congratulation to became a grandfather