In order to compose childcare actions, National Policy for Comprehensive Child Health Care, in its strategic axis II -Breastfeeding and Complementary Healthy Eating -advocates adequate nutrition and access to safe and nutritious food as a child's right to achieve high standards of health. By considering the importance of offering healthy food for growth and development of Brazilian children, scientific evidence about the need to promote beneficial lifestyle habits and the absence of validated national instruments that investigate parents' knowledge about their children's healthy eating, this study had the objective of carrying out the cultural adaptation, in Brazil, of the Infant Feeding Questionnaire (IFQ), for use with parents of children of preschool age. A methodological study was carried out in a medium-sized municipality in the northeast of São Paulo between March and September 2018.To reach the objective, we go through the steps proposed by referential that involved idiomatic standardization of the instrument; expert committee review; retro translation; patient panel; adapted version of the instrument and pilot test. We also performed language standardization in order to maintain understanding of the instrument when culturally adapted in the same language but in different countries. Two Portuguese-speaking professionals evaluated this version and resulting in two versions, which was later synthesized in a single one. The Committee of experts consisted of seven professionals who validated this version with agreement above 80% for 54 of the 55 statements of the IFQ.We accepted the changes because they did not interfere with the IFQ and we obtained the author's approval. Back translation was performed, also with necessary changes to the Brazilian reality and after authorization by the author. For the semantic validation, 30 parents (panel of patients) of children of children enrolled in Child Living Centers (CLC) answered items from the IFQ, which was subdivided into five groups of 11 statements each. Understanding of all items was verified, except for one that is not part of the Brazilian reality; also changed with permission of the author, resulting in the adapted version. Then, we conducted a pilot study with 55 parents from other CLC; they pointed out true or false for all 55 statements in the IFQ.For analysis we used the Kuder-Richardson coefficient (KR20) and a correlation between the items and the total was found with truth for values greater than 0.7. From the semantic validation, we identified percentages above 92% for good compression of the IFQ items. The results of the pilot study indicated values between 0.72 and 0.76 for the 55 questionnaire items. This demonstrated good consistency, which confirms the reliability of the Brazilian version.The culturally adapted version of the IFQ in Brazil is reliable and valid for assessing parent's knowledge of healthy eating in preschool children. Its use has the potential to contribute whit professionals who work with children in this age group and to enable...