Matthew (26-weeker - born Feb 10) seems to be doing ok. His oxygen percentages are coming down. A week ago he shot up to 60 - 65%. Last night he stayed in the 30's. I am, however, concerned that he is not gaining weight as he should. The last few days he has hovered around a pound-and-a-half. 1lb 8.8oz, then 8.0, then 8.2, then lost an ounce (down to 7.2) last night. How much should I be converned about this?