I have a 19mo old DS who is still breastfeeding mornings and evenings. I am also 5 mo pregnant, and recently he's been refusing breast (says no and brings a book or some other activity). I understand this is probably due to my milk changing. I was hoping to feed him until he is 2, and then tandem feed both children as long as they want. Is there anything I can do, except keep offering and let him decide?