Final answer:
A child born without functioning B cells would have immunodeficiency and be more prone to infections.
Step-by-step explanation:
A child born with a congenital disease resulting in the total loss of B cells would have immunodeficiency. B cells are responsible for producing antibodies, which play a crucial role in fighting infections. Without functioning B cells, the child would have a weakened immune system and be more susceptible to infections.
One example of a genetic disorder that affects B cells is agammaglobulinemia, which leads to severe infections early in life. Another example is hypogammaglobulinemia, which results in respiratory and gastrointestinal infections.