Rowland: When Alfie was born did it change your life?
Julie: Totally. It made it better. Definitely.
Rowland: But aren’t there things that you miss that you could do before you had a child?
Julie: They seem so superficial now. They seem so selfish. I mean, I still go out. I still have my circle of friends. But, just playing with him for the afternoon and teaching him something new makes up for it
句中miss在这里怎么理解？它的宾语是that you could do before you had a child还是things（也就是说是两个并列定语从句，即things that you miss that you could do before you had a child＝things that you miss and that you could do before you had a child）？
如果that you could do before you had a child还是things是宾语从句，那miss是什么意思？

Rowland: When Alfie was born did it change your life?
Rowland: Alfie出生后，你的生活有变化吗？

Julie: Totally. It made it better. Definitely.
Julie: 完全变了，生活更加美好了。

Rowland: But aren’t there things that you miss that you could do before you had a child?
Rowland:但是难道就没有你怀念的一些事，就是在有孩子之前才能做的一些事？

事实上这里的that you miss 和that you could do before you had a child是两个并列的定语从句，都是用来修饰之前的things的。由于这里是口语，因此语句结构比较不够严禁，事实上你可以在其中加个逗号来理解，这样就比较容易了，即：But aren’t there things that you miss ，that you could do before you had a child?
miss在这里指的是“想念，怀念”。