Premature infants undergo repetitive painful procedures. A Canadian study found the pain induced by these procedures affected weight gain and body growth. The authors concluded the link between neonatal pain and postnatal growth was probably limited to the first few weeks of life. The study was limited to 78 infants born at 32 weeks or less. The median number of skinbreaking procedures for this group was 64.5, double that of babies born at greater than 32 weeks.