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Breastfeeding longer improves children’s verbal IQ

Mothers have been urged to breastfeed for longer after new research indicated that it improves child intelligence and language ability.

Scientists found that greater duration of breastfeeding, even when it was not exclusive, led to higher intelligence scores at age seven.

Compared with bottle-fed children, seven-year-olds breastfed for the first year of life were likely to score four points higher in a test of verbal IQ.

Verbal intelligence scores at age seven increased by 0.35 points for every extra month of breastfeeding.

A similar but less pronounced trend was seen for non-verbal IQ scores, which increased by 0.29 points per breastfeeding month

Three-year-olds also benefited, having higher scores in a picture vocabulary language acquisition test the longer they had been breastfed.

Exclusive breastfeeding - rather than any level of breastfeeding - had the greatest effect, boosting verbal IQ scores by nearly a point per month.

Seven-year-olds who were exclusively breastfed for the first six months after birth had an almost five point advantage over those who were bottle fed.

A US team of researchers reported the findings in the journal JAMA Pediatrics.

The scientists, led by Dr Mandy Belfort, from Boston Children’s Hospital, wrote: “Our results support a causal relationship of breasfeeding in infancy with receptive language at age three and with verbal and non-verbal IQ at school age.

“These findings support national and international recommendations to promote exclusive breastfeeding through age six months and continuation of breastfeeding through at least age one year.”

The study included 1,312 mothers and children who had taken part in Project Viva, a long-term investigation of pregnancy and child health.

A number of factors that might have influenced the results, including home environment and mothers’ IQ, were accounted for by the researchers.

Children took part in several tests, including the Peabody Picture Vocabulary Test at age three and the Kaufman Brief Intelligence Test at age seven.

Certain nutrients in breast milk may benefit the developing infant brain, it has been suggested. One of these is docosahexaenoic (DHA), which is abundant in fish.

Part of the research looked at whether mothers’ fish consumption was linked to the benefits of breastfeeding. However, the results were non-significant.

In an accompanying editorial, Dr Dimitri Christakis from Seattle Children’s Hospital Research Institute, wrote: “The problem currently is not so much that most women do not initiate breastfeeding, it is that they do not sustain it. In the United States, about 70% of women overall initiate breastfeeding, although only 50% of African-American women do. However, by six months, only 35% and 20%, respectively, are still breastfeeding.”

He added that workplaces should provide better facilities for breastfeeding mothers, and breastfeeding in public should be “destigmatised”.

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Readers' comments (3)

  • Does anyone have the citation or a link to the study the article is referring to?

    Unsuitable or offensive?

  • When will we start to admit that these sorts of facts are linked to the child's home / family input, its not the breastfeeding that results in better skills its the environment the child is being brought up in! And yes breastfeeding tends to happen (not always obviously) in homes where parents are more motivated. breast milk is of course a good thing but it's not a magic potion!

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  • @ Anonymous | 30-Jul-2013 2:31 pm

    http://archpedi.jamanetwork.com/article.aspx?articleid=1720224

    will get you to the abstract, if you've got an athens account maybe that'll get you full access?

    @ Sarah Brooklyn | 30-Jul-2013 6:24 pm

    the above article and the abstract says they controlled for "sociodemographics, maternal inelligence, and home environment." i have always suspected that child iq IS more influenced by the quality and quantity of maternal contact than nutrition (within certain limits) but dr's mandy belfort and dimitri chistakis are saying exactly the opposite, and say they have the proof to back their assertion.

    so unless i get the opportunity to pick apart their paper, or unless you offer evidence to support your claim, in the interests of evidence based practice, i'm gonna have to side with belfort et al and their peer reviewed research.

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