Breast-feeding and cognitive development in the first seven years of life

The relationship between breast-feeding practices and childhood intelligence and language development at ages 3, 5 and 7 years was examined in a birth cohort of New Zealand children. The results showed that even when a number of control factors including maternal intelligence, maternal education, maternal training in child rearing, childhood experiences, family socio-economic status, birth weight and gestational age were taken into account, there was a tendency for breast-fed children to have slightly higher test scores than bottle-fed infants. On average, breast-fed children scored approximately two points higher on scales with a standard deviation of 10 than bottle-fed infants when all control factors were taken into account. It was concluded that breast-feeding may be associated with very small improvements in intelligence and language development or, alternatively, that the differences may have been due to the effects of other confounding factors not entered into the analysis.     

Accidents in the first three years of life

This study is concerned with a group of normal children. It reports a correlation between the condition of a baby at birth, as recorded by a modified Apgar scale, and a future history of accidental injury before age three. Various other behavioural characteristics were also associated with having scored relatively poorly on the Apgar type scale; in addition, there was some evidence that the pregnancies and previous obstetric histories of the mothers of poor birth status babies had been different. Possible connections between the behavioural characteristics and a liability to accidental injury are discussed, as is the part played by the relatively poor status at birth.     

Airborne endotoxin is associated with respiratory illness in the first 2 years of life

To determine the influence of endotoxin on the incidence of acute respiratory illness during the first 2 years of life, we carried out a longitudinal follow-up study, beginning at birth, of 332 children born in Prince Edward Island, Canada. We measured 5-day averaged air endotoxin in the homes of children, whose parents provided information by daily symptom diaries and twice-monthly telephone contact for up to 2 years. Endotoxin concentration was 0.49 +/- 3.49 EU/m3 (geometric mean +/- geometric SD), and number of annualized illness episodes was 6.83 +/- 2.80 (mean +/- SD). A doubling of the air endotoxin concentration was associated with an increase of 0.32 illness episodes per year (p = 0.0003), adjusted for age, year of study, breast-feeding, environmental tobacco smoke, child care attendance, indoor temperature, and income. Indoor mold surface area and fungal ergosterol were not significantly associated with endotoxin. Airborne endotoxin appears to be a risk factor for clinically symptomatic respiratory illnesses during the first 2 years of life independent of indoor fungus.     

Severity and timing of stunting in the first two years of life affect performance on cognitive tests in late childhood.

Undernutrition in infancy and early childhood is thought to adversely affect cognitive development, although evidence of lasting effects is not well established. With the use of data from the Cebu Longitudinal Health and Nutrition Study, we assesshere the relationship between stunting in the first 2 y of life and later cognitive development, focusing on the significance of severity, timing and persistence of early stunting. The sample included > 2000 Filipino children administered a cognitive ability test at ages 8 and 11 y. Stunting status was determined on the basis of anthropometric data collected prospectively between birth and age 2 y. Children stunted between birth and age 2 y had significantly lower test scores than nonstunted children, especially when stunting was severe. The shortfall in test scores among children stunted in the first 2 y was strongly related to reduced schooling, which was the result of a substantial delay in initial enrollment as well as higher absenteeism and repetition of school years among stunted children. Interactions between stunting and schooling were not significant, indicating that stunted and nonstunted children benefitted similarly from additional schooling. After multivariate adjustment, severe stunting at age 2 y remained significantly associated with later deficits in cognitive ability. The timing of stunting was also related to test performance, largely because children stunted very early also tended to be severely stunted (chi(2) P = 0.000). Deficits in children's scores were smaller at age 11 y than at age 8 y, suggesting that adverse effects may decline over time. Results emphasize the need to prevent early stunting and to provide adequate schooling to disadvantaged children.     

Development of food acceptance patterns in the first years of life

As young omnivores, children make the transition from the exclusive milk diet of infancy to consuming a variety of foods. They must learn to accept a set of the foods available in their environmental niche, and they 'come equipped' with a set of predispositions that facilitate the development of food acceptance patterns, constrained by predisposition and limited by what is offered to them. While children are predisposed to like sweet or salty foods and to avoid sour or bitter foods, their preferences for the majority of foods are shaped by repeated experience. The predispositions that shape food acceptance patterns also include neophobia and the predisposition to learn to prefer and accept new foods when they are offered repeatedly. In addition, the predisposition for associative conditioning affects children's developing food acceptance patterns, resulting in preferences for foods offered in positive contexts, while foods presented in negative contexts will become more disliked via the learning of associations with the social and environmental contexts. Children also learn to prefer energy-dense foods when consumption of those foods is followed by positive post-ingestive consequences, such as those produced when high-energy-density foods are eaten when hungry. Although children are predisposed to be responsive to the energy content of foods in controlling their intake, they are also responsive to parents' control attempts. We have seen that these parental control attempts can refocus the child away from responsiveness to internal cues of hunger and satiety and towards external factors such as the presence of palatable foods. This analysis suggests that taking a closer look at what children are learning about food and eating may provide clues regarding the formation of children's food acceptance patterns, and that this approach also suggests potential causative factors implicated in the aetiology of obesity and the emergence of weight concerns. Current data, although limited, suggest that child-feeding practices play a causal role in the development of individual difference in the controls of food intake, and perhaps in the aetiology of problems of energy balance, especially childhood obesity. These relationships should be pursued in future research.     

Maternal life stress and health during the first 3 years postpartum

ABSTRACT

Health problems may occur in mothers and can persist during the postpartum. Life event stress (LES) is a risk factor for poor maternal health. We examined the relations of LES and rise in LES over time to maternal health during the first three years postpartum. We used data from 1,364 mothers obtained between 1991 and 2007 in the U.S. National Institute of Child Health and Human Development Study of Early Child Care and Youth Development. Information on maternal sociodemographics and early postpartum health was collected 1 month after childbirth. Maternal reports on health status and LES were obtained at 6, 15, 24, and 36 months postpartum. Latent growth curve analyses were performed, with maternal sociodemographics and early postpartum health as covariates for which statistical adjustment was made. Maternal health declined steadily in a linear pattern with marked individual differences, whereas maternal LES increased gradually in a linear pattern. Moreover, faster maternal health decline was associated with poorer early health at 1 month postpartum, greater exposure to LES at 6 months postpartum, and faster rise in LES exposure over time. Decline in maternal health may be explained at least in part by the deleterious effects of exposure to stressful life events.     

Consumption of organic foods and risk of atopic disease during the first 2 years of life in the Netherlands

We prospectively investigated whether organic food consumption by infants was associated with developing atopic manifestations in the first 2 years of life. The KOALA Birth Cohort Study in the Netherlands (n 2764) measured organic food consumption, eczema and wheeze in infants until age 2 years using repeated questionnaires. Diet was defined as conventional ( 90 % organic). Venous blood samples taken from 815 infants at 2 years of age were analysed for total and specific IgE. Multivariate logistic regression models were fitted to control for potential confounding factors. Eczema was present in 32 % of infants, recurrent wheeze in 11 % and prolonged wheezing in 5 %. At 2 years of age, 27 % of children were sensitised against at least one allergen. Of all the children, 10 % had consumed a moderately organic diet and 6 % a strictly organic diet. Consumption of organic dairy products was associated with lower eczema risk (OR 0.64 (95 % CI 0.44, 0.93)), but there was no association of organic meat, fruit, vegetables or eggs, or the proportion of organic products within the total diet with the development of eczema, wheeze or atopic sensitisation. Further studies to substantiate these results are warranted.     

Understanding cognitive development: automaticity and the early years child

In recent years a growing body of evidence has implicated deficits in the automaticity of fundamental facts such as word and number recognition in a range of disorders: including attention deficit hyperactivity disorder, dyslexia, apraxia and autism. Variously described as habits, fluency, chunking and over learning, automatic processes are best understood in terms of their distinctive properties. While typically identified as fast, parallel, attention-free processes, a commonly agreed definition of automaticity continues to elude theorists investigating this concept. Most theorists would, however, agree that since attentional resources are finite, automaticity of basic facts serves to free sufficient mental resources for a learner to focus their attention on the novel or more complex aspects of a task. Yet despite the importance of automaticity to the learner, the term remains largely unfamiliar to most educationalists and early years practitioners. In order to address this issue, the present paper seeks to review several influential theories of automaticity, to describe the problems associated with defining a process as automatic and to draw from relevant research to demonstrate how the early years environment can be organised to promote automaticity in the young learner.     

Immunisation of a cohort Pacific children living in New Zealand over the first 2 years of life

Pacific children have had consistently evidenced low rates for routine childhood immunisations. Using the Pacific Islands Families: First 2 Years of Life cohort study, we investigated the immunisation rate of Pacific infants residing in New Zealand at 24-months postpartum. Full immunisation was reported for 89% of infants, substantially increased from the 53% found in the 1992 national survey and closer to the New Zealand Ministry of Health's target of 95%. Increased parity and maternal smoking were associated with incomplete child immunisation status. Initiatives to increase immunisation rates amongst Pacific children appear to be succeeding and warrant continuation.     

Child health clinic attendance during the first two years of life

Attendance at child health clinics in three contrasting urban areas is described. Sociodemographic analysis of clinic attenders in the inner city area showed that families in poor socio-economic circumstance attended child health clinics more frequently than their more fortunate contemporaries during the first six months of life. Health visitor home visiting was a major determinant in clinic attendance rates.     

Maternal depression and perceived social support as predictors of cognitive function trajectories during the first 3 years of life for preterm infants in Wisconsin

Background Among families of infants born preterm, the association between post‐natal depression and children's cognitive function is not well understood, but thought to be compromised. The purpose of this study is to investigate maternal depressive symptoms and perceived social support as predictors of children's cognitive function trajectories. Methods This is a longitudinal study of a sample of infants born preterm (less than 37 weeks) in Wisconsin. This study includes 130 infants who were hospitalized in one of three Wisconsin neonatal intensive care units in 2002–2005 and followed until 36 months of age. Maternal depressive symptoms were measured using the Center for Epidemiologic Studies Depression Scale. Social support was measured using the Maternal Support Scale. Children's cognitive function was measured using the Bayley Scales of Infant Development, 2nd Edition, and the Stanford–Binet Intelligence Scale, 5th Edition. Results Children's cognitive function trajectories declined initially and then increased. Being female (coefficient = 5.14, SE = 1.89) and non‐poor (coefficient = 11.26, SE = 5.78), and having a mother who has a graduate degree (coefficient = 7.67, SE = 3.37) was associated with higher levels of cognition initially. Being white was associated with a more optimal cognitive trajectory. Although depression did not predict children's cognitive trajectories, the presence of clinically elevated depressive symptoms at 9 months post term was associated with lower cognitive functioning at 16 months when mothers reported low social support. Conclusion Post‐natal depressive symptoms appear to have a meaningful, dynamic influence on the cognitive outcomes of children born preterm, above and beyond family socio‐demographic risk when the presence and timing of perceived social support are considered. Interventions to ameliorate developmental risk associated with preterm birth should include repeated assessments of maternal social support and post‐natal depression and be targeted towards socially disadvantaged families.     

Parental smoking and lower respiratory illness in the first three years of life.

The relationships between parental smoking and the rates of lower respiratory illness during the first three years of life were examined for a birth cohort of 1265 New Zealand children. Lower respiratory illness varied significantly with maternal smoking for the first year; there was equivocal evidence of a relationship between maternal smoking and lower respiratory illness in the second year; and by third year the relationship had clearly disappeared. Paternal smoking had no significant effect on rates of lower respiratory illness at any time. Application of logistic regression showed that for the first year rates of lower respiratory illness were approximately linearly related to maternal smoking: increases of five cigarettes a day resulted in an increase of 2.5 to 3.5 incidents of lower respiratory illness per 100 children at risk. Statistical control for maternal age, education, family size, and family living standards showed that the relationship between maternal smoking and rates of lower respiratory illness was not significantly influenced by these factors.