Baby weight depend on genes and what we consume. For me nothing to worry about as long as baby's healthy. And doesn't mean a heavy baby is a healthy baby too. Furthermore if baby's big or heavy, then it will be difficult for your birth plan too. For me both pregnancy baby both was about 3kg whereas I am petite. Was I worried baby's too big or too small, yes I do. But it is all estimated, baby weight will be +/- about 200gm. If the doctor mentioned it is within normal range, not underweight or too small it is good.
To increase baby's weight after birth you eat well and healthy, lots of BM or where necessary FM and baby will put on weight. The only thing that worries nurses and doctor when baby lose weight.
Anonymous