How do you say

There has been great change in Beijing’s weather over the last month.

..in Chinese?

北京过去一个月的天气变化很大。

běi jīng guò qù yí gè yuè de tiān qì biàn huà hěn dà 。

How do you say "After the baby turns one month, we’ll move into our new flat in two months time." in Chinese?