She went there to be with the baby's supposed father, and she went before her third trimester. She tried to come back toward the end of her third trimester and the airlines wouldn't allow her to fly during that time.
She was an 18-year old college student in Hawaii, knocked up by an African who was already married, marries him anyway after her first trimester. Surely something concrete would document her visit to her "husband's" tribal homeland. Postcard home? Air letter to a best friend? Call back to Mom and Dad in Hawaii with the charges reversed? Hospital records from Kenya?
Also, what about Barack Sr's travel records and passport? Surely they too would show evidence of his trip to Kenya during the middle of the year.
It is far easier to assume that she stayed in Hawaii to have her baby than a phantom trip to Kenya, with no proof she was there except, again, some toothless old African women.
Don't get me wrong -- I'm on your side here -- but the "having the baby in Africa" story doesn't hold water without additional evidence.
Refusing to release more than a backdated COLB from 2007 of course makes things very murky. This could have many other explanations, such as his mother deliberately giving up baby Barack's citizenship when she married the Indonesian.