Safety in Lactation: Female sex hormones

Oestrogens are normally used as postmenopausal hormone replacement (HRT) which is not relevant to breastfeeding Oestrogens used for other hormone replacement indications are covered in this section.
Progestogens use for endometriosis and menstrual disorders is normally by daily, oral administration of higher cumulative doses than used for contraception. There are no published data on their effects in infants or on lactation when used in this way.
Oestrogens and progestogens can suppress early lactation. Ideally, their use should be delayed for 6 weeks postpartum, until breastfeeding is fully established, although this may present an unacceptable clinical risk to the mother in this situation.