1 month weight gain

So my little guy is 1 month today. He was 9 lbs 13 ozs, 20.5 inches at birth. Was 9 lbs 8 ozs at his first appt at 4 days old.

At his 1 month appointment today he was 10 lbs and 22.5 inches. We’re breastfeeding. We’ve introduced bottles now and he’s eating good and still nursing fine.

Does only gaining 1/2 pound seem average? Doctor wasn’t concerned but he has dropped percentiles on the growth chart. I’m not worried but feel like my daughter gained weight quicker. So wondering what everyone else’s little ones 1 month weight gain was like?