I have a 15-week old son. It seems that he spits up more after breastfeeding than he does when he takes EBM from a bottle. We use Playtex drop-ins with a newborn nipple. He is gaining weight fine and is a so-called "happy spitter," but now that I'm seeing so little spit up after a bottle feeding, I'd like the same after the breast if possible. any suggestions would be great!