Introdução: A exposição do feto a grandes quantidades de componentes tóxicos decorrente do consumo de tabaco e álcool durante a gestação pode acarretar problemas tais como prematuridade, baixo peso ao nascer, aborto e distúrbios no desenvolvimento infantil. Essa associação tem sido recentemente objeto de diversos estudos, porém os resultados são contraditórios devido aos métodos e amostras distintos. Objetivo: Estudar a associação entre o consumo de tabaco e/ou álcool pela gestante e o desenvolvimento infantil entre 13 e 30 meses de idade. Método: Estudo descritivo e analítico, prospectivo, de uma coorte de conveniência iniciada no pré-natal (2010), avaliada no nascimento e a partir do início do segundo ano de vida (2011/2013) no município de Ribeirão Preto, SP. A variável dependente foi o escore médio do desempenho dos filhos nas cinco subescalas da Bayley Scales of Infant and Toddler Development ® third edition - screening test (Bayley - III®). A variável exploratória foi o consumo de tabaco e/ou álcool na gestação, classificado como nenhum consumo, consumo isolado de tabaco ou álcool e consumo concomitante das substâncias. As diferenças entre as médias nos escores das cinco subescalas foram comparadas por meio de regressão linear, em quatro modelos: ajustado pelas faixas etárias de aplicação do teste, propostas no manual técnico da escala (modelo 1); ajustado pelas faixas etárias, por consumo de tabaco e/ou álcool na gestação e características da mãe, da gestação e do parto (modelo 2); ajustado pelas faixas etárias, por consumo de tabaco e/ou álcool na gestação e variáveis do seguimento das crianças (modelo 3); ajustado por todas as variáveis dos modelos anteriores (modelo 4). Resultados: Foram estudadas 998 mulheres, das quais 121 (12,1%) fumaram e 246 (24,6%) referiram ter consumido bebida alcoólica na gravidez. O consumo isolado de álcool foi três vezes maior (18,6%) do que o consumo apenas de tabaco (6,1%). O consumo combinado de tabaco e álcool durante a gestação foi de 6,0%, sem diferença segundo a faixa etária das crianças avaliadas (p>0.05). Não houve diferença nas médias do escore cognitivo segundo o consumo das substâncias em nenhum modelo. Consumo concomitante foi associado a menor média dos escores em ambas as subescalas de comunicação (diferença de 1,12 pontos para comunicação receptiva, IC95% 0,45 a 1,79; 1,19 pontos para comunicação expressiva, IC95% 0,31 a 2,07) e motoras (diferença de 1,20 pontos na subescala motora fina, IC95% 0,55 a 1,85; 0,70 pontos para subescala motora grossa, IC95% 0,13 a 1,28), em torno de um ponto em média, comparado com nenhum consumo de tabaco e álcool. Conclusão: Consumo concomitante de tabaco e álcool teve efeito significativo, porém pequeno, na média dos escores de comunicação e motores, mas não na subescala cognitiva. / Introduction: Fetal exposure to large amounts of toxic compounds resulting from the consumption of tobacco and alcohol during pregnancy can lead to problems such as preterm birth, low birth weight, miscarriage and disorders in child development. This association has recently been the subject of several studies, but the results are contradictory due to differences in methods and samples. Objective: To study the association between the consumption of tobacco and/or alcohol by pregnant women and child development between 13 and 30 months of age. Methods: This is a descriptive and analytical, prospective study of a cohort of convenience initiated prenatally (2010), assessed at birth and from the beginning of the second year of life (2011-2013) in the city of Ribeirão Preto, Brazil. The dependent variable was the mean score of the performance of children in the five subscales of the Bayley Scales of Infant and Toddler Development ® third edition - screening test (Bayley - III®). The explanatory variable was the use of tobacco and/or alcohol during pregnancy rated as no consumption, isolated consumption of tobacco and alcohol and concomitant consumption of the substances. The differences between the mean scores in the five subscales were compared using linear regression in four models: adjusted for age of test application proposed in the technical manual of the scale (model 1); adjusted by age groups, for tobacco and/or alcohol use during pregnancy and maternal characteristics of pregnancy and childbirth (model 2); adjusted by age groups, for tobacco and/or alcohol use during pregnancy and variables related to children in the follow-up (model 3); adjusted for all the variables of the previous models (model 4). Results: 998 women were studied, 121 of them (12.1%) smoked and 246 (24.6%) reported having consumed alcohol in pregnancy. The isolated alcohol consumption was three times higher (18.6%) than the consumption of tobacco only (6.1%). The combined use of tobacco and alcohol during pregnancy was 6.0%, with no difference according to the child\'s age group (p> 0.05). There was no difference in mean cognitive score based on consumption of substances in any model. Concomitant intake was associated with lower mean scores in both communication subscales (1.12 points difference for receptive communication, 95% CI 0.45 to 1.79; 1.19 points for expressive communication, 95% CI 0.31 to 2.07) and motor subscale (1.20 points difference in the fine motor subscale, 95% CI 0.55 to 1.85; 0.70 points for gross motor subscale, 95% CI 0.13 to 1.28), around a point on average compared with no consumption of tobacco and alcohol. Conclusion: concomitant consumption of tobacco and alcohol had a significant effect, however small, in the mean score of the communication and motor subscales, but not in the cognitive subscale.

<p>Due to the great transitions and turmoil uniquely attributed to the period of adolescence, youth experience a greater risk for substance use and the multitude of concerns that coincide with the early onset of substance use. Many biological and environmental factors have been investigated as predictors of adolescent substance use. Executive function and disruptive behaviors are two important individual characteristics linked to adolescent substance use. Both smoking during pregnancy and sibling relationships are separate contexts that can mitigate or exacerbate the associations of executive function and adolescent substance use. The present study focuses on development of substance use through executive function deficits and disruptive behavior, while considering smoking during pregnancy and sibling relationships as unique moderators of these pathways. This work addresses a novel, interrelated set of questions with a series of three studies. The central hypothesis driving this program of research is that smoking during pregnancy and sibling relationships are under-studied contexts that can mitigate or exacerbate the associations of executive function, disruptive behavior, and adolescent substance use. This dissertation examines whether: (1) executive function mediates the smoking during pregnancy-disruptive behavior association and smoking during pregnancy exacerbates the executive function-disruptive behavior association, (2) smoking during pregnancy exacerbates the association between executive function and disruptive behavior during adolescence using a sibling comparison design, and (3) sibling relationship quality moderates developmental trajectories of executive function on the transition from disruptive problems to adolescent substance use using a high-risk, longitudinal sample. Findings challenge the link between exposure to smoking during pregnancy and both executive function and disruptive behavior. Further, these findings reinforce the need to utilize genetically-informed designs when examining potential effects of smoking during pregnancy. Additionally, this dissertation found support for the link between executive function and disruptive behavior, but not executive function and substance use. </p>

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