Serum immunoglobulin levels in healthy children (g/L) Age group IgG IgA IgM Newborn 5.190-10.790 (8.490) 0.001-0.018 (0.009) 0.018-0.120 (0.069) 4 months- 3.050-6.870 (4.970) 0.110-0.450 (0.280) 0.310-0.850 (0.580) July- 4.090-7.030 (5.560) 0.210-0.470 (0.340) 0.330-0.730 (0.530) 1 year- 5.090-10.090 (7.590) 0.310-0.670 (0.490) 0.980-1.780 ( 1.380) 3 years old- 6.600-10.39 (8.240) 0.580-1.000 (0.790) 1.100-1.800 (1.450) 7 years old- 7.910-13.070 (10.720) 0.850-1.710 (1.280) 1.200-2.260 (1.730) 12 years old- 8.270-14.170 (11.220) 0.860-1.920 (1.390) 1.220-2.560 (1.890) Note: Means in parentheses