Breastfeeding medicine and lactation support — branching viva

Opening — framing the problem

The examiner begins: a three-week postpartum mother has fever, malaise and a hot, tender, wedge-shaped area of erythema in the right breast, and the infant is feeding well. Talk me through your approach. [5]

I would frame this as the mastitis spectrum rather than simple engorgement, because the fever, malaise and unilateral wedge of erythema and induration fit inflammatory or bacterial mastitis. My priority is to keep milk removal going, because stopping feeding worsens stasis, while I assess whether this is inflammatory only or needs antibiotics. [5]

Branch A — the management ladder

What is your first-line management, and when would you add antibiotics? [5]

First line is continued effective milk removal by feeding through it, an improved latch and anti-inflammatory measures, with a review at twenty-four to forty-eight hours. I would add antibiotics for suspected bacterial mastitis, using flucloxacillin or dicloxacillin 500 mg four times daily for ten to fourteen days, or cephalexin for penicillin allergy. I would avoid aggressive pumping or deep massage, because the 2022 protocol frames mastitis as a spectrum in which over-emptying worsens inflammation. [5]

Branch B — the mechanism

Why does continued milk removal treat mastitis, and what governs milk supply in general? [1] [3]

Prolactin, released after suckling, drives milk synthesis in the alveolar cells, and oxytocin contracts the myoepithelial cells for the let-down reflex. Supply equals demand: frequent effective removal is the signal for more production, so maintaining removal treats stasis and protects supply, while stopping feeding would suppress it. [1] [3]

Branch C — the pivot to low supply

Now a mother brings a fussy infant who feeds every ninety minutes but is thriving. She thinks her supply is low. How do you decide? [3]

I would distinguish true from perceived low supply using output, growth and transfer. Six or more heavy wet nappies, frequent stools and a weight gain of about 150 to 200 grams per week in a thriving infant mean perceived, not true, low supply. I would reassure, encourage skin-to-skin and demand feeding, and avoid unnecessary supplementation, which would lower removal and suppress supply. [3]

Closing — the late-preterm twist

The infant was born at thirty-six weeks. How does that change your plan? [12]

A late-preterm infant is at higher risk of sleepy feeding, poor transfer, hypoglycaemia, jaundice and suboptimal weight gain. I would step up surveillance with glucose and bilirubin monitoring, watch growth closely, provide intensified lactation support, and keep a low threshold to supplement with expressed milk while protecting the establishment of supply. [12]