Obama was born 8/4/1961. My bet is that his mother was off from school in August since it would be summer vacation and she went to Kenya to have the baby when school ended, probably around June of 1961. She may not have even looked pregnant at the time she left.
You are right about the fact that she may not have even looked pregnant at the time she left. Back in the late 50’s early 60’s the “shift” dresses were in. I remember them well and sure put them to use! They nicely covered excess weight and I sure needed to back then at 155lbs! (Luckily from ‘68 on I managed to drop to my normal weight of 115! :)
Ann only attended one semester of school at the University of Hawaii in 1960. She did not attend school again until she registered at the University of Washington in August of 1961. She returned to attend the spring semester at the University of Hawaii in 1963, and obtained her B.A. in Mathematics from U of H at Manoa in 1966.