Iron and calcium supplements can generally be taken more than 6 hours apart during pregnancy. The main reason why iron and calcium cannot be taken together is that there is competition between the two. Both iron and calcium need to absorb the same protein in the body to function, and taking them together will affect the absorption of both at the same time. When the small intestine absorbs nutrients, there is no way to transit multiple elements at the same time, which will make too much of the elements can not be absorbed and used by the body, it has been excreted, resulting in the waste of two nutrients. Taking these two nutrients at the same time may also increase the burden on the stomach and intestines, causing certain stimulation to the stomach and intestines and causing various discomfort symptoms. It is still recommended to consult an obstetrician for the specific timing of taking iron and calcium supplements. In addition to medication supplementation, pregnant women can also supplement iron and calcium through their daily diet by eating more foods rich in iron and calcium, such as milk, soybeans, animal offal, etc.