Can we give ebm meant for a mth old baby to a toddler?

I’ve read about tandem nursing in which a mother breastfeeds both a newborn and a toddler. Some mothers chose to do that because they had to stop nursing their older child when their supply was affected after getting pregnant with the second child. Hence, after they gave birth, they would breastfeed both children. It seemed fine to those mothers. The recommendation is to ensure that the infant gets to nurse first since he/she is getting all their nutrients from the breast milk while the toddler is able to get nutrients from regular meals. Have not read anything with regard to expressed breast milk and am not too sure if there is any difference. I would think that it is unlikely to be harmful to your toddler as long as he/she is having a balanced diet. The expressed breast milk could then be just a supplement to his usual meals. You can trying calling your doctor to see if he/she has any advice.