In short: "transitional" milk comes 2-5 days after birth, mature milk - by the end of the first or second week. Frequent attachment is the main stimulus for lactation. Breast engorgement is a normal, although uncomfortable stage.
This material is for informational purposes only and does not constitute medical advice and is not a substitute for medical advice. If a child's sleep is accompanied by alarming symptoms, a pronounced deterioration in health, problems with breathing, feeding or weight gain, it is necessary to consult a qualified medical specialist as soon as possible, and not rely only on information from the Internet.