How is ABO incompatibility treated?
Last updated September 6, 2026.
ABO incompatibility is treated by controlling the jaundice and anemia it causes, most often with frequent feeding and phototherapy, and only rarely with IV immune globulin or an exchange transfusion. The treatment level depends on the baby's bilirubin number, age in hours, and how fast the level is rising, not on the blood types alone. Most babies with a type O mother and type A or B blood never need anything beyond routine feeding and a bilirubin check. Babies who do need phototherapy typically improve within a day or two, and many go home with a plan for a repeat bilirubin or blood count, since anemia can show up in the first few weeks. Feeding 8 to 12 times a day helps clear bilirubin through stool, so tell your care team if feeding is going poorly or if wet diapers drop off. ABO incompatibility during a blood transfusion is a separate emergency and is handled by stopping the transfusion immediately.
What to do
- Track feeding: Feed the baby 8 to 12 times in 24 hours, since stooling is how bilirubin leaves the body.
- Keep the bilirubin recheck: A single number means little without the trend, so go to the scheduled repeat test even if the skin looks better.
- Watch for anemia later: Ask about a blood count in the weeks after discharge if your baby seems unusually pale, sleepy, or hard to feed.
- Call the same day: Yellow color reaching the belly or legs, poor feeding, few wet diapers, or a baby who is hard to wake needs prompt evaluation.
- Skip home remedies: Sunlight through a window, water, or sugar water do not treat jaundice and can delay real care.
- Report transfusion symptoms: Fever, chills, back pain, dark urine, or trouble breathing during a transfusion should be reported to the nurse right away.