In pregnant BALB/c mice, PBA decreases placental Abca1, Abcb1a and Abcb1b (both encoding P‐gp in rodents) and Abcg2. 11Similarly, in pregnant C57BL/6 dams, PBA leads to IUGR, PTL and impairs the placental expression of ABCA1/Abca1, P‐gp/Abcb1b and BCRP/Abcg2,9 suggesting that MiP has the potential to increase fetal exposure to a range of clinically relevant substrates capable of profoundly impacting fetal outcome, via dysfunction of ABC transporters in the placental barrier. Here, ABCG2 is linked to fetal growth restriction.