Caffeine is a psychoactive drug because it changes brain function and results in alterations in perception, mood, or consciousness. Caffeine is a central nervous system stimulant found naturally in the seeds, nuts, and leaves of over 60 species of plants. This stimulant is commonly in coffee, tea, and energy drinks and is the most widely consumed drug in the world. Caffeine is one of the first things to be cautious about after seeing a positive pregnancy test. Trying to figure out how much caffeine is safe during pregnancy and breastfeeding can be challenging. This article examines how you process caffeine, how it can affect your baby, and the recommendations and research on the safety of caffeine during pregnancy and breastfeeding.