First some medical people say my son is doing good gaining weight. And then his pediatrician says he…

First some medical people say my son is doing good gaining weight. And then his pediatrician says he is not doing good weight gain. And the cardiac nurse practitioner says my two month old son is doing good and can probably wait to have open heart surgery next year. So a few months until next year. I just don't understand. Is he doing good on weight gain or not!