In the first instance, child development is marked by various transformations. During this period, psychosocial, motor and cognitive skills undergo various gains, and this process is therefore affected by interacting factors. At a second stage, when development is below expectations, damaging effects related to social and economic aspects can arise. Such a situation contributes to a scenario of scarce resources, which can increase disparities during the life cycle.

The aim of this study is to verify the relationship between child development and its determinants considering children being admitted to an aquatic stimulation project.

A bivariate logistic linear regression analysis was carried out and the data was analyzed using the PSPP program, version 2.0. As the participants were children from an aquatic stimulation project, the study can be classified as exploratory, quantitative and cross-sectional. Various aspects were analyzed, and in order to characterize socioeconomic status, the Brazilian Economic Classification Criterion (CCEB) was used. In order to assess the opportunities at home to stimulate the baby, the version adapted for Portuguese Affordances in the home Environment Motor Development- infant scale (AHEMD-IS) was used.In addition, a questionnaire was created with the child's identification data, information about the pregnancy and sociodemographic characteristics of the family. Another instrument used was the Well-being of Young Children (SWYC) as a dependent variable. In addition, the infant's head circumference was collected and then these data were entered into the World Health Organization curves.

The variables gender and gross motor AHEMD were significantly associated with child development (SWYC developmental milestones). Analysis of data from 49 boys and 52 girls showed that being female and having a greater number of gross motor toys were respectively 0.34 and 5.4 times more likely to have an adequate SWYC developmental milestones category.

Based on the aforementioned data, it should be noted that the behavior of infants is directly affected by the environment in which they live, so it is clear that factors such as gender and the number of toys offered to these children have a direct impact on their development.

In short, it can be seen that beyond the individual, child development is a social and economic issue, so studies such as this can act as a guide for states, as guided by scientific estimates they can implement public policies which take into account children's needs. It is therefore essential that more and more studies delve into the various aspects of child development, so the dissemination of research like this can boost new studies on this subject, as well as helping new researchers on this scientific journey.