Why does my fetus stop growing after 3 weeks?

Q: I am married for the last 4 years. Since two years we are planning to have child. We attempted three times and all times we had to abort at the 3rd month. All the three times the fetus stopped growing after 3 weeks. What could be the problem?

A:There are many causes like - hormonal, infections, genetic, anatomic, immune causes etc, which could be theoretically possible for this kind of a problem. But what is the real cause in your case could only be figured out after all the investigations have been done.