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  • Title: Crying behaviour in early infancy is associated with developmental outcome at two years of age in very low birth weight infants.
    Author: Munck P, Maunu J, Kirjavainen J, Lapinleimu H, Haataja L, Lehtonen L, PIPARI Study Group.
    Journal: Acta Paediatr; 2008 Mar; 97(3):332-6. PubMed ID: 18298782.
    Abstract:
    AIM: To evaluate the association between infant fussing and crying and developmental outcome in very low birth weight (VLBW) infants. METHODS: Hundred and seventeen VLBW infants were followed up to 24 months of corrected age. The duration of fussing and crying and frequency of fuss/cry bouts were measured at term 6 weeks and 5 months of corrected age. Cognitive and motor development was assessed at 24 months of corrected age. RESULTS: The increased duration of combined fuss/cry at term associated with lower psychomotor developmental index (PDI), [regression coefficient (b)=-0.83, p=0.025]. Crying at term associated negatively with mental developmental index (MDI) (b=-0.91, p=0.040) and PDI (b=-1.10, p=0.015). The associations between fuss/cry and PDI, and crying and PDI persisted in multiple regression analysis (b=-0.89, p=0.030 and b=-1.23, p=0.018, respectively). Excessive fuss/cry (>or=180 min/day) at term associated with lower PDI (p=0.005) and at 6 weeks with lower MDI (p=0.024) and PDI (p=0.012). Increase in the frequency of fuss/cry bouts at 5 months associated with higher PDI in both simple (b=2.90, p=0.045) and in multiple regression analysis (b=3.60, p=0.019). CONCLUSIONS: In VLBW infants, longer duration of fussing and crying in very early infancy, but not at 5 months, is associated with less optimal development at 24 months of age.
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