Dear Hubby, Iron is known to cause inflammation in the stomach (gastritis) by increasing acidity. It leads to vomiting. The colour of iron is back and hence the vomitus is black in colour. Please give break to iron tablets for few days and take some antacids only for those 2-3 days. Then you can restart them. Daily consumption of iron may be then minimized to alternate days. If she continues to take any antacids, the iron will not be effectively absorbed. So avoid prolonged use of antacids. Instead switch to iron spansules which is a time release iron form. At this stage of pregnancy, iron consumed by her is getting deposited in the foetal iron stores for the use in early infancy. So do not leave iron consumption. I hope you got the message.