Child growth standards

Growth of healthy infants and the timing, type, and frequency of complementary foods

WHO Working Group on the Growth Reference Protocol and the WHO Task Force on Methods for the Natural Regulation of Fertility

American Journal of Clinical Nutrition 2002;76:620-627

Background

Growth patterns of exclusively and predominantlybreast-fed infants differ from those of non-breast-fed infants, but less is known about associations among growth patterns and different durations of exclusive breast-feeding and the types and frequency of complementary foods.

Objective

We examined these associations, particularly between 4 and 6 mo of age, using data from a unique longitudinal 7-country study.

Design

Data from the World Health Organization Multinational Study of Breast-feeding and Lactational Amenorrhea on infants living in generally favourable environments were used. Multilevel analyses described growth and the relation between growth and variables related to feeding.

Results

Small differences in growth that were statistically significant but probably not biologically important were noted among infants in whom complementary foods were introduced at different times. Weight gain was more sensitive to feeding frequencies than were gains in length, but the cumulative 10-wk differences were small. The most extreme differences were equivalent to 10 centiles of the weight and height distributions at 6 mo of age.

Conclusions

These results do not provide compelling evidence of benefit or risk related to growth and the timing of introduction of complementary foods at any specific time between 4 and 6 mo of age. Thus, postnatal growth appears to not be sensitive to the differential timing of introduction of complementary foods nor to differential types and frequencies of complementary foods in healthy infants living in environments without major economic constraints and low rates of illness. These results, however,may not indicate growth differences in populations living in poor environments.

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