Figure 2: Feeding mode at 4 months of age had a significant impact on the thymic size. Those breastfed at 4 months of age have the largest thymus when compared to the three other feeding groups. However, the HIV-EU infants at 4 months of age have a thymic size the same as the partially breastfed infants. By 8- and 12-month followups the difference in Ti between the feeding groups disappeared. Ti is given as medium and with Q1  and Q3.