parth is a premature baby, born at 33 weeks with 1kg weight. Please tell the recommended weight as per is birth history

A. For Prem child is expected a child should gain minimum of 350 g in a month could be a course more than that but if your child is gaining a minimum 350 per month also it would be Idea considered good technically if I look at the minimal weight side then your child should be at least 1400 g more than the weight