An 11-month-old female presented with her family to her pedi…

An 11-month-old female presented with her family to her pediatrician with the complaint of failure to thrive. Her personal and family history histories are unremarkable. The patient was underweight and had tachycardia with a faint heart murmur. She also has a cleft lip and palate.   Patient Results Reference Interval WBC 5.8 4.5-11.0 x 10^9/L RBC 1.27 4.3-5. x 10^12/L HGB 3.8 13.5-16.0 g/dL HCT 12.3 39-55% MCV 99.9 80-100 fL MCH 30.1 25.4-34.6 pg MCHC 31.1 31-37 g/dL RDW 21.2 11.5-14.5 % PLT 330 150-400 x 10^9/L   The patient’s differential was unremarkable with 24% neutrophils, 74% lymphocytes, and 2% monocytes.   What is the differential diagnosis?