Do you think I can give my 3yo milk which I expressed for my newborn? I am usually expressing in the evenings for DF, but DS2 never drinks much of that so I usually freeze to build a stock. However I am on holidays now and I don't have the opportunity to freeze so I would have to throw milk out, which seems to be a waste... So in the morning DS1 got my milk in a cup. Liked it. Is that fine you think...?