What must be the max weight of a baby during a normal delivery birth?I am in 35 weeks and my baby is 3 kgs?

the first day of my menstrual bleeding is 16th december,2007.my conception date is approximately 11th january,2008.my predicted due date through ultrasonogram is 29th september,2008.I am 35 weeks pregnant.my baby is now about 3 kilograms.it is still one month to go and I am wondering if my baby grows very big for normal delivery.what should be the maximum weight of a baby during its birth.