There is nothing to worry about. For any study showing that there is a (minimal) increase in the percentage of developmental and/or cognitive disorders in children born as a result of micromanipulation compared to naturally-conceived children, there is at least one study showing lack of association between the two. But the important thing to consider is the simple fact that without said technology, these children would never have been born! Therefore, even if there is some minor increase in developmental disorders (which is highly questionable), it should be related to defects in the eggs or sperm, due to which the fertilization was not possible in the first place.