If a child birth takes place in Rahu mahadasha (mother's Rahu mahadasha) what will be the effect on a baby ?

In my experience, I have seen that there arise a sudden complication out of blue which was never expected as the regular check up and the gynecologist didn't see any abnormality. Pre mature delivery is a possibility in this case when the mother of the child is going thru Rahu mahadasa. As it is always said that during Rahu mahadasa there always diagnosis error by the doctors. They can't conclude any thing in first attempt. The rahu dasa complicate the medical issue and so the person suffers.