There is no exact answer, only some general guidelines. It is important to first be taking a pre-natal vitamin daily, too. Then, figure out what the mother's daily caloric intake was before pregnancy. Then, add 100 to 150 extra calories a day to that for every child. For example, if the mother usually ate 1,400 calories a day, when pregnant she should be eating between 1,400 and 1,550 calories a day. If that same mother was pregnant with twins, she should then be eating between 1,500 and 1,600 calories a day.
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