We recently showed that a haploinsufficiency state occurs in women with heterozygous SLC30A2/ZnT2 mutations,20 indicating that a single SLC30A2/ZnT2 allele with an LoF mutation is sufficient to result in TNZD.1, 10, 11, 12, 21 The World Health Organization postulates that breastfeeding is the best diet for the health of infants. Here, SLC30A2 is linked to zinc deficiency, transient neonatal.