Capacity of producing IgG stas at what age

Ans. is 'a' i.e., 6 months Immediately after bih, the newborn has high level of IgG antibodies in blood stream. But these antibodies are passively transferred to the baby from mother (i.e., maternal antibodies). During next few months, the maternal IgG antibodies steadily decrease. When healthy baby is about 2-3 months old, the immune system stas producing its own IgG antibodies. Once healthy babies reach six months of age, their IgG productin reaches at normal level. Note IgM antibodies production stas before bih only (3-6 months before), but at very lowlevel.