Yes, you can use it topically on your pregnancy belly and wait till your baby's born. Cajeput oil is considered safe to use while breastfeeding, so you can use it topically as well. Cajeput essential oil is mildly toxic if ingested in large quantities. Avoid prolonged or excessive use of cajeput essential oil. Pregnant women should avoid using it on their bellies due to possible harm to the fetus. Children also shouldn’t use cajeput oil except under the supervision of a professional.