My 9-week old son has gained over 6.5 lbs since birth. Is he overeating?

I am exclusively feeding, he eats every 2.5-3 hours during the day and wakes up 1x at night to feed. He vomits occasionally but does not have any other colicky symptoms. He is 50th percentile for length but >80% for weight. I have been doing Baby Wise since the beginning, focusing on full feedings, wake time after feedings, etc. Should I be concerned that he is eating too much? Today he was very hungry less than 2.5 hours since his last feeding, but after I fed him, he had projectile vomit. Is this a concern?