How can sugar and caffeine affect my unborn child?

Depends: Sugar intake is rather innocuous & simply a food. Babies system needs it to grow & what you don't consume your body makes & sends to baby. Caffeine is considered a category c med, animal studies showing some problems for fetuses but no long term studies on human subjects to confirm it. Occasional use is likely ok but heavy consumption may be a problem. Newborns have real pbs getting rid of it.