From: Optimal fetal growth for the Caucasian singleton and assessment of appropriateness of fetal growth: an analysis of a total population perinatal database
Factor
N
%
Maternal Smoking
27,326
21.62
Maternal vascular disease
8,334
6.59
Birth defects [29]
7,520
5.95
Maternal (pre-existing or gestational) diabetes
5,051
4.00
Multiple pregnancy
3,991
3.16
TORCH infectionsa
2,945
2.33
High altitudeb
0
0.0