Anti-A, anti-B, antibody appear in child ?
Ans. is 'd' i.e., After 6 months Titre of anti-A and anti-B antibodies is almost zero immedietly after bih. Infants sta producing anti-A and anti-B antibodies at age of 2-8 month when corresponding antigen is not present in cell. Maximum titre rech at 8 to 10 years of age after that it staed declinning.
Just after bih
1 week after
6 week after
After 6 months