My baby does not look like any of my others and is slow in rolling over. What could it be?

Developmental Delay. Delayed developmental milestones are of concern because they indicate the presence of pathology. There are many causes of these observed milestones delays and need to be evaluated carefully in order to ascertain the cause. Common causes are perinatal events that subject the fetus to hypoxia. Other causes include muscular dystrophies and genetic disorders that cause hypotonia.