Hello girls, could you please tell me, on May 6th, a girl was born via…

Hello girls, could you please tell me, on May 6th, a girl was born via C-section weighing 3340 and measuring 51 cm. At discharge, her weight became 3060. Today, almost a month old, she weighs 3600 and measures 57 cm. Plus, there's a little one, I breastfeed constantly, the milk is always present on my chest, the baby weighs 3600. They say that our baby has low birth weight, in a month he should supposedly weigh 4100 ?. How do your babies weigh?