在1999年度，20分析看认知发展调查，坚决母乳喂养已经连接上的成绩完全认知改善作为模拟支持，形成利润扩大鼓励母乳喂养期的比较。这种利润是非常好的低概念质量的后代建立。形成的修养忍耐无论如何预成年意味着（Anderson et al，1999）。
These learning performed in the recent years demonstrate the indication that breastfeeding improves the neuro-improvement of newborn children and their learned and educational capacity in afterwards life. The increment of IQ through breastfeeding is specifically identified with the term of breastfeeding. These profits are well-built for the babies of low conception mass on breast milk sustaining. The underprivileged that are further inclined to go through into youngster unhealthiness are further inclined to profit as of upgraded ideal breastfeeding exercises (Horwood et al., 2001).
A study in 1999 by Vetergaard et al. claimed that breastfeeding poses a constructive consequence on continuing brain improvement. They analyzed 1,656 newborns at the time of 8 months to decide whether length of breastfeeding influences psychological progress. Three progressional targets were calculated: swarming, pincer hold, and polysyllable gabbling. The quantity of newborns who mastered the explicit landmarks amplified without fail with rising extent of breastfeeding.
In the year 1999, the investigation of 20 analyses which looked at cognitive advancement, was dead set that breastfeeding had been connected with altogether superior scores for cognitive improvement as in comparison to simulated bolstering and that the formative profits of breastfeeding expanded with term of encouraging. This profit was very well-built for offspring of low conception mass. The formative accomplishment endures at any rate by means of pre-adulthood (Anderson et al, 1999).