How do you say

I bought a new dress and I’m going to wear it for a month.

..in Chinese?

我买了一件新衣服,打算穿一个月。

wǒ mǎi le yī jiàn xīn yī fú , dǎ suàn chuān yí gè yuè 。

How do you say "And at three months, he started saying “Dada.”" in Chinese?