How do you say

We’ve known each other for three months. We had a walk by the sea last week.

..in Chinese?

我们已经认识三个月了,上周我们去了海边散步。

wǒ men yǐ jīng rèn shí sān gè yuè le , shàng zhōu wǒ men qù le hǎi biān sàn bù 。

How do you say "And children start teething at about a month." in Chinese?