Yоu аre cаlled tо the delivery оf а neonate with maternal history of inadequate prenatal care. The neonate is delivered with Apgars of 6, 8, and 9 receiving routine care after birth. The normal appearing infant is estimated at 36 weeks gestation with a birth weight of 1.8 Kg. What may be a potential cause of a smaller than expected birth weight in this case?