Is it normal for premature babies to grow more than one kilogram a month?

Premature infants a month long 1 jin is normal, premature infants digestive function is weak, development is slightly slower than full-term infants, a month growth of 1 to 2 jin is normal. If premature infants weight growth less than 1 jin per month, it means slow growth, need to go to the hospital to find out the cause, symptomatic treatment.