Milk stasis, blocked ducts, inflammatory or infectious mastitis, and breast abscess represent the spectrum of maternal hyperlactation syndrome. Management includes decreasing the rate of milk synthesis, improving milk removal out of the breast, and antibiotic therapy for ascending lactiferous duct infections and mastitis. Thriving infants who choke and splutter at the breast, feed frequently, are colicky, and have explosive, watery bowel movements have infant hyperlactation syndrome and are managed by decreasing quantity and increasing quality of breast milk drunk.