If you are experiencing a late letdown reflex, gently massage your breasts to initiate a letdown reflex. Moreover, you can also press your nipples between your fingers in a circular motion to initiate the letdown reflex. Pumping breast milk is also helpful in starting a letdown reflex so the baby can have an adequate supply of milk. Frequent breastfeeding can also result in a faster letdown reflex, and it will improve with time.