No, it is advised against using MDMA while breastfeeding. MDMA can pass into breast milk and thus reach the baby. Since little is known about the effects of MDMA on babies, it is best to avoid using MDMA during the breastfeeding period. It is always important to prioritize your baby's health and safety.

It is becoming not recommended to use MDMA while breastfeeding, because the substance passes into breast milk and thus reaches the baby.
If you do decide to use MDMA (for example, during a therapeutic session), the advice is generally to follow the following strict guidelines for your child's safety:
Minimum waiting time (8 days): The active breakdown products (metabolites) of MDMA have a half-life of approximately 38 hours. Theoretically, it takes 5 times the half-life for a substance to disappear from your body. For MDMA, this amounts to 190 hours, which is almost 8 days is.
Recommended safety margin (2 weeks): Due to the vulnerability of babies and the lack of research into the effects of MDMA on them, it is recommended to be on the safe side. two weeks to wait before breastfeeding again.
Protocol (Pumping and disposal): During these two weeks, you must express breast milk and throw away to maintain milk production without exposing the baby to the substances.
Alternatives: Switching to bottle feeding during this period (formula or a pre-built supply of 'clean' breast milk) or simply postponing MDMA use until after the breastfeeding period.
Important: Because MDMA use also affects your own physical and mental state (such as the "after-dip"), it is wise to take into account the care of your child in the days following a session. Always consult a doctor or lactation consultant if in doubt.