জন্মের সময় বাচ্চার ওজন কত কেজির কম হলে ঝুঁকিপূর্ণ হিসেবে ধরা হয়?

Low birth weight:

Low birth weight is a term used to describe babies who are born weighing less than 5 pounds, 8 ounces (2,500 grams).
An average newborn usually weighs about 8 pounds. A low-birth-weight baby may be healthy even though they are small.
But a low-birth-weight baby can also have many serious health problems.

Source:urmc.rochester.edu