Using CLAP, few variables showed differences at P < 0.05: mothers with SFH <10th centile had more acidic urine (P = 0.015), higher hepcidin (P = 0.044), lower TNF-α (P = 0.007), lower IL-1β (P = 0.014), and lower than expected vitamin D deficiency (P = 0.013).Using a Bonferroni-corrected P < 0.001, only underweight was found more often than expected in women with SFH <10th centile when compared with SFH ≥10th centile (P < 0.0001). The gene discussed is HAMP; the disease is vitamin D deficiency.