Growth - Infant Feeds

Growth Calculator


  
    
      
        Weight:
        
          
          
        
      
      
        Dates:
        
          
          
        
      
    
    
  

  
    Patient info — optional
    
      Sex
      
        
        
      

      Date of birth
      
      ⚠ Date of birth is after one or more weight entries — please verify.

      GA at birth
      
        
          
          weeks
          
          days
        
        Birth classification valid for GA 22–42 wks only
      

      Birth weight
      
        
        g
        Z:
        
        
      
    
    
      
      Fenton 2025
    
    
  

  
    Weight measurements
    
      Date
      Weight (g)
      
      Z-score
      
    
    
    
    
      Selected interval
      
        
          g/day
          —
        
        
          g/kg/day
          —
        
        
          ΔZ
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      Select exactly 2 rows from the table below

About

Corrected age displayed up to 2 years.

Birth classification (Fenton 2025) valid for GA 22–42 weeks.

Values are rounded to 1 decimal place. Not intended for use in the first 14 days of life.

g/d generally recommended for infants >2 kg and/or >36 weeks

g/kg/d generally recommended for infants <2 kg and/or <36 weeks

Target Ranges

References

Hodges, Bethany S., et al. Academy of Nutrition and Dietetics Pocket Guide to Neonatal Nutrition. 3rd ed., Academy of Nutrition and Dietetics, 2023.

Koletzko, B. Nutritional Care of Preterm Infants: Scientific Basis and Practical Guidelines. 2nd ed., vol. 122, Karger, 2021.

Fenton, Tanis R., et al. “Fenton Third-Generation Growth Charts of Preterm Infants Without Abnormal Fetal Growth: A Systematic Review and Meta-Analysis.” Paediatric and Perinatal Epidemiology, vol. 39, no. 6, 2025, pp. 543–555. doi:10.1111/ppe.70035.

Goldberg, Dena L et al. “Identifying Malnutrition in Preterm and Neonatal Populations: Recommended Indicators.” Journal of the Academy of Nutrition and Dietetics vol. 118,9 (2018): 1571-1582.