I don't really have any suggestions -- DS has used nebs since he was a week or two old. In fact when he was recovering from bowel obstruction surgery as a newborn and couldn't have food yet, we had to laugh because he'd stick his tongue out, as if we was trying to eat the mist from the tube -- we used the blow-by method when he was teeny tiny. I will say he does prefer a soft feeling mask. Is it possible to use the Bubbles fish mask instead of the harder masks?