When the kid is two years old, regarding day services, is in general defined, toddlers are in nurseries or at home when parents have the possibility to be there with them, another option is to be with a familiar like a grandmother.
For those who started nurseries very early they are students since the four-month years old, but if there is something that is permanent studied is the psychologic, social and endocrine impact of being with parents specialy with the mother. Babies need her, they don’t should be separated from their mother.
My study blog about education 