Baby weight gain ?

At my son’s two month appt he was 11lbs 1oz and he will be 4 months in a few days and I weighed him at home on a baby scale and he is only 13 lbs 7oz?? Does this seem like enough ? My other two babies were huge and off the charts he seems so tiny ? Plenty of wet diapers and a very happy baby . He is also very long 🤷🏻‍♀️