How do you say

Three months later, the baby was born, and the house rang with laughter.

..in Chinese?

三个月后,小宝宝出生了,家里充满了欢乐。

sān gè yuè hòu , xiǎo bǎo bǎo chū shēng le , jiā lǐ chōng mǎn le huān lè 。

How do you say "He works out every day, and it has paid off in increased stamina over the last three months." in Chinese?