Drewett R, Amatayakul K, Wongsawasdii L, Mangklabruks A, Ruckpaopunt S, Ruangyuttikarn C, Baum D, Imong S, Jackson D, Woolridge M
Department of Psychology, University of Durham, UK.
Eur J Clin Nutr. 1993 Dec;47(12):880-91.
A group of 60 infants representative of a rural Thai population were studied longitudinally over the first year of life. Their breast milk intake, supplementary food intake and nursing patterns were measured for 2 consecutive days at about 15, 45, 90, 180, 270 and 360 days of age. For the sample as a whole, the estimated peak value for energy intake from breast milk was 529 kcal (2213 kJ) and occurred at 34 days post-partum. Thereafter milk intake declined, with 40% of infants fully weaned by the end of the first year. Supplements were introduced early, with 15% of infants supplemented by 2 weeks and 68% by 6 weeks. Higher levels of supplementation were associated with lower breast milk intake. In addition there was an independent positive effect of nursing patterns (number of breast feeds per day). Interaction terms show that both supplementary feeding and number of feeds have quantitatively different effects at different ages: breast milk intake varies more with level of supplementation in younger infants than in older infants, and varies more with number of feeds in older infants than in younger infants. Higher peak levels of breast milk intake were followed by a steeper decline, and infants who took more breast milk at 15 days were more likely to be fully weaned by their first birthday.
对一组代表泰国农村人口的60名婴儿进行了为期一年的纵向研究。在他们大约15、45、90、180、270和360日龄时，连续两天测量他们的母乳摄入量、辅食摄入量和喂养模式。对于整个样本，母乳能量摄入的估计峰值为529千卡（2213千焦），出现在产后34天。此后，母乳摄入量下降，到第一年末，40%的婴儿完全断奶。辅食添加较早，15%的婴儿在2周时添加辅食，68%的婴儿在6周时添加辅食。较高水平的辅食添加与较低的母乳摄入量相关。此外，喂养模式（每天母乳喂养次数）有独立的积极影响。交互项表明，辅食喂养和喂养次数在不同年龄有不同的定量影响：较年幼婴儿的母乳摄入量随辅食添加水平的变化比年长婴儿更大，而年长婴儿的母乳摄入量随喂养次数的变化比年幼婴儿更大。母乳摄入量的峰值越高，随后下降越陡，15天时母乳摄入量较多的婴儿在一岁生日时更有可能完全断奶。
