Test-tube baby

Every couple want to have a healthy baby, but some people, for many reasons they can't have /are unable to fulfil that dream.
The (main) reasons of for infertility is are the following./ are as follows (Or: here/below are the main reasons for infertility)
First of all, because of study and work, women  may miss the best age to get pregnant because they prioritise their studies or their career/work
The second reason is endocrine problems–, Modern people are under great pressure which leads to endocrine dyscrasia (which, in turn....?)
The third/Thirdly, with the development of the economy, the pollution of our environment becomes more and more serious (?and what is the polluted environment impact on the fertility?)

A baby born through the test-tube is the same as a baby conceived naturally. Most of the families can afford the cost.
So, more and more people use the test-tube baby technology to have a baby.


I hope this helps.
It's ok from the point of view of the language, but you may need to strengthen your arguments (see comments in brackets)

Jo.