This work describes some of the consequences of new regulations on nurseries in the Madrid area that are related to ratios and group size (especially after the decree 18/2008). Analyses are based on educators and education staff’s point of view. Special emphasis is made on consequences on children behavior. Two hundred and seventy seven professionals that belonged to more than 53 nurseries of Madrid area voluntarily answered a survey with open questions about educative process and child’s behavior. Qualitative and quantitative analyses show that, from educator’s point of view, increasing ratio child-educator has consequences in the variables explored. Main effects were found for the activities made in classrooms (loosing educative standards), hygiene and supply routines (loosing intrinsic values and autonomy support), space and time distribution, support staff organization and relation with families (reduced to quick information interchanges). Directors, classroom tutors and support educators perceive these changes in a similar fashion. The vast majority perceived changes on children’s behavior- increases in the number of conflicts and anxiety. These results agree with previous research on the influence of child-educators ratios and group size on quality of education. Implications for child development are discussed.