Mothers should ideally stay at home. I know the feminist movement is causing controversy and an epidemic when it comes to this topic, however, when they eventually have kids, it is normally the mother who offers to stay home with the kids while the father goes to work. Its never a huge fight and it shouldnt be that big of a concern.
Young children can blossom in day care when they know they have love at home but are with other children during the day and with adults who are creative in teaching and playing. Not every parent and certainly not every mother would be good at this or happy doing it. But it is good if some loving adult can be available part of the day at home.