*Possible long term complications of trisomy 21 in an otherwise 'normal' baby could include developmental delay, as well as possible increased risk for pediatric leukemia. [mosaicism.bcchr.ca]

Oexle, Konrad, et al. 3.7 Mb tandem microduplication in chromosome 5p13.1-p13.2 associated with developmental delay, macrocephaly, obesity, and lymphedema. Further characterization of the dup (5p13) syndrome. [rarediseases.org]

congenital anomalies (15 cases) intrauterine fetal demise (5 cases), IUGR (4 cases), isolated congenital heart disease (1 case) In another study, of 66 cases with prenatal diagnosis of mosaic trisomy 21 only 25 had outcome data. 17 showed features compatible [mosaicism.bcchr.ca]

These can be divided into maternal—alcohol, smoking, illegal drugs, malnutrition, essential hypertension, diabetes—fetal—infection, chromosomal abnormalities, multifetal pregnancy, specific genetic disorders—and placental—abruption, abnormal implantation [fn.bmj.com]

impairments vitamin deficiencies These symptoms are also common in people with mosaic Down syndrome. [healthline.com]