so my son was 8lbs 7ozs when he was born, while at the hospital he lost 3ozs and then gained it back…

so my son was 8lbs 7ozs when he was born, while at the hospital he lost 3ozs and then gained it back before his first doctor's appointment last week. and Monday when we went in for them to check his weight and schedule his circumcision they told me he is now 9lbs 4ozs! even the nurse said she could tell he gained weight since last time she seen him lol and I'm only breastfeeding