In our research we were looking for a relati onship between childhood obesity and the mother’s body type, lifestyle. We have examined the relati onship between body type according to BMI and own opinion of respondent mothers with the use of Cramer’s V coeffi cient. The opinion of respondents does not refl ect the reality in Hungary. The Cramer’s V coeffi cient, which measures the relati onship between body type according to BMI and own opinion of mothers was medium: 0.519, which means that the respondents cannot assess their own BMI and body type. The body type of children perceived by their mothers was also inaccurate. According to our research we can state that body type of mothers exercises infl uence on the body type of children. The extent of infl uence depends on the age of children (3.6 – 8.5%).