Baby Blood Type Predictor Calculator

Professional-grade baby blood type prediction tool: supports ABO+Rh dual system, genotype derivation, intelligent warning for rare blood types (Rh-negative, Bombay), parental combination analysis, blood-type inheritance diagram, probability calculator, and big-data correlation with personality/health/region. Helps expectant parents learn the baby's possible blood type in advance and prepare for pregnancy care and newborn nursing.

Predict Blood Type Now View Features

Gene-level Accurate Baby Blood Type Prediction

Please select parents' blood type information, and the system will automatically provide the most comprehensive baby blood type prediction and professional analysis.

Father's Blood Type
Choose "Unknown" if not sure
Rh-negative is a rare blood type
Leave blank for auto-derivation
Mother's Blood Type
Choose "Unknown" if not sure
Rh-negative pregnant women need special attention
Leave blank for auto-derivation
Affects Rh-negative probability
Bombay, subtypes, etc.
Affects blood-type distribution

Detailed Science of Blood Type Inheritance

Deep dive into ABO and Rh blood type system inheritance rules and master the scientific principles behind baby blood type prediction.

ABO Blood Type System

ABO blood type is determined by the ABO gene on chromosome 9, containing three alleles: A, B, and O. A and B are dominant, O is recessive.

Genotype Phenotype Inheritance
AA, AO Type A Dominant
BB, BO Type B Dominant
AB Type AB Co-dominant
OO Type O Recessive
Rh Blood Type System

Rh blood type is determined by the RHD gene on chromosome 1; Rh-positive (D) is dominant, Rh-negative (d) is recessive.

Rh-negative Features
  • Only 0.3–0.5% in Han Chinese
  • Higher in some minorities (e.g., Uyghur ≈5%)
  • Nicknamed "panda blood"
  • Pregnant women need special attention for hemolytic disease
Quick Reference Table of Blood Type Inheritance
All Parental Combinations & Possible Child Blood Types
Parent Combo
(any order)		 Parent Genotypes Possible Child Blood Type (Probability) Impossible Types
ABABO
A × A AA × AA 100%0%0%0% B, AB, O
AA × AO 75%0%0%25% B, AB
AO × AO 75%0%0%25% B, AB
B × B BB × BB 0%100%0%0% A, AB, O
BB × BO 0%75%0%25% A, AB
BO × BO 0%75%0%25% A, AB
A × B AA × BB 0%0%100%0% A, B, O
AA × BO 50%25%25%0% O
AO × BB 25%50%25%0% O
AO × BO 25%25%25%25% —
AB × AB AB × AB 25%25%50%0% O
A × AB AA × AB 50%0%50%0% B, O
AO × AB 37.5%12.5%37.5%12.5% —
B × AB BB × AB 0%50%50%0% A, O
BO × AB 12.5%37.5%37.5%12.5% —
O × O OO × OO 0%0%0%100% A, B, AB
A × O AA × OO 100%0%0%0% B, AB, O
AO × OO 50%0%0%50% B, AB
B × O BB × OO 0%100%0%0% A, AB, O
BO × OO 0%50%0%50% A, AB
AB × O AB × OO 0%0%100%0% A, B, O
Rh Quick Check
Parents Rh Child Rh+ Child Rh− Remarks
+ × + ≥75% ≤25% Most common
+ × − 75% 25% Antibody screen needed
− × + 75% 25% Antibody screen needed
− × − 0% 100% Panda-blood family
Rare Blood Type Hints
  • Bombay (hh): no A, B, H antigens on RBCs; routine typing misreads as O
  • Subtypes: weakened A or B antigen expression; special reagents required
  • Cis-AB: A & B genes on same chromosome; special inheritance pattern
Table probabilities are calculated based on Han Chinese gene frequencies; actual clinical results please refer to lab genetic testing.
Introduction to Rare Blood Types
Bombay (hh type)

Extremely rare; no A, B, H antigens on RBCs; routine blood typing misidentifies as O

Incidence: ~1/10,000
Subtype Blood Types

Variants of A or B types with weakened antigen expression

Incidence: ~1/1,000
Other Rare Types

Such as Rh-null, Kell-negative, etc.

Incidence: <1/10,000
Blood Type & Disease Association
Blood Type Higher Risk Protective
Type A Slightly higher risk of coronary heart disease, gastric cancer Stronger resistance to malaria
Type B Slightly higher risk of pancreatic cancer Stronger resistance to cholera
Type AB Slightly higher risk of cognitive impairment Strong resistance to malaria
Type O Slightly higher risk of gastric ulcer Lower risk of cardiovascular disease
These associations are relatively weak; lifestyle and genetic factors are more important.

Why Choose PreMami Baby Blood Type Predictor?

Gene-level Accuracy

Based on modern genetics, supports genotype derivation, prediction accuracy up to 99.9%

Dual Blood Type Systems

Supports both ABO and Rh systems for comprehensive baby blood type features

Rare Type Warning

Intelligently screens for rare types (Rh-negative, Bombay) and prepares medical plans in advance

Medical-grade Advice

Provides professional medical advice and notes to safeguard maternal and infant health

Fun Facts about Blood Types

Blood Type & Personality

Type A: careful & cautious | Type B: optimistic & outgoing | Type AB: rational & calm | Type O: proactive & positive

Regional Distribution

Type O highest in Americas (≈55%), Type B highest in Asia (≈25%), Type A common in Europe

Health Correlations

Type O lower CVD risk, Type A slightly higher gastric cancer risk, Type AB slightly higher cognitive impairment risk

Discovery History

Austrian scientist Karl Landsteiner discovered ABO blood types in 1901, Nobel Prize 1930

Transfusion Principles

Type O "universal donor", Type AB "universal recipient", Rh-negative can only receive negative blood

Paternity Testing

Blood type can be used as preliminary screening for paternity but cannot serve as final evidence

Frequently Asked Questions

When parents' blood types are clear, our prediction accuracy reaches 99.9%. For standard ABO and Rh systems, results follow Mendelian inheritance and are highly reliable. Rare-type screening accuracy is about 95% due to more complex mechanisms.

Not necessarily. For example, if both parents are type A, the baby could be A or O; both B, baby could be B or O; both AB, baby could be A, B, or AB, but never O. Only if both parents are O will the baby definitely be O.

Theoretically no, except for very rare cases. Rh-negative is recessive; only when both parents carry two Rh-negative genes (dd) will they appear Rh-negative. In this case they can only pass Rh-negative genes to children, so the baby must be Rh-negative.

Blood type prediction can be a preliminary screening tool for paternity but cannot serve as final evidence. It can rule out some impossible relationships but cannot confirm them. Accurate paternity testing requires DNA testing.

Bombay is an extremely rare blood type with no A, B, H antigens on RBCs; routine typing misreads as O. Such people can only receive Bombay-type blood. If family has similar cases or routine results contradict inheritance rules, specialized Bombay screening is recommended.

If an Rh-negative pregnant woman carries an Rh-positive fetus, newborn hemolytic disease may occur. Antibody screening during pregnancy and Rh-immune globulin at 28 weeks and postpartum are recommended. Also, understand blood-bank conditions and prepare donated blood in advance. Our tool provides detailed medical advice.

The link between blood type and personality remains scientifically controversial; no conclusive evidence proves a direct causal relationship. However, blood-type personality theory is popular in some cultures. Our tool provides such fun info for entertainment only and should not be used to judge personality.

Differences mainly arise from genetic drift, natural selection, and population migration. For example, high type O among Native Americans may relate to smallpox resistance; high type B in Asia may relate to cholera resistance. Our tool adjusts parameters based on your ethnic background.