Which Blood Groups Can Parents Pass On? Confused about baby’s possible blood group? Here’s the complete parent–child combination list ⬇️ 👨‍👩‍👦 Parent Blood Group → Child CAN / CANNOT 1️⃣ O O → ✅ O | ❌ A, B, AB 2️⃣ O A → ✅ A, O | ❌ B, AB 3️⃣ O B → ✅ B, O | ❌ A, AB 4️⃣ O AB → ✅ A, B | ❌ O, AB 5️⃣ A O → ✅ A, O | ❌ B, AB 6️⃣ A A → ✅ A, O | ❌ B, AB 7️⃣ A B → ✅ A, B, AB, O | ❌ — 8️⃣ A AB → ✅ A, B, AB | ❌ O 9️⃣ B O → ✅ B, O | ❌ A, AB 🔟 B A → ✅ A, B, AB, O | ❌ — 1️⃣1️⃣ B B → ✅ B, O | ❌ A, AB 1️⃣2️⃣