pregnancy and lactation diets are pretty close to each other in regards to needs. both focus on predominently the same nutrients, though lactation generally calls for lower amounts. THat is, pregnancy diets are usually 1 plus 1/10 (so, normal caloric intake plus 1/10) so a 2000 cal diet would be 2200 during pregnancy. Whereas a lactation diet is typically (or appears to be) roughly one and 1/20, so a 2000 cal diet would be 2100 cals. And of course, those extra 200 or 100 cals would be nutrient specific to the pregnancy or lactation needs.
you could, concievably, combine the two if you are both pregnant and nursing--thereby having a diet that, assuming your base diet is 2000 cals, would be 2300 cals.
you could, concievably, combine the two if you are both pregnant and nursing--thereby having a diet that, assuming your base diet is 2000 cals, would be 2300 cals.