MLPA was performed on all infants with undetectable SMN1 cycle threshold (Ct) levels to assess the copy numbers of exons 7 and 8 in both SMN1 and SMN2. We identified one patient with SCID, two patients with XLA, and nine patients with SMA, one of whom also had Wiskott–Aldrich Syndrome (WAS). This evidence concerns the gene SMN2 and Wiskott-Aldrich syndrome.