Hi, Primolut is a medication that contains the active ingredient norethisterone, which is a synthetic hormone that can be used to delay periods. However, it is not recommended to use Primolut while breastfeeding, as the drug can pass into breast milk and potentially harm the baby. In addition, taking Primolut may also affect milk production and reduce the amount of milk produced. If your wife needs to delay her period for religious purposes, she should speak to her healthcare provider about other options that are safe for her and her baby while breastfeeding. One option may be using a progestin-only contraceptive pill, which can also help delay periods without affecting milk production or passing into breast milk. It is important to always consult with a healthcare provider before taking any medication while breastfeeding, as some medications can have adverse effects on the baby. If you require a personalized response, kindly use the Ask A Doctor service and post a follow-up. Take care. Hope I have answered your question. Regards, Dr. Priyanka, General & Family Physician