Hi - I am a "Nanny" and I care for one child at a time, each day of the week. It has been my experience with infants, babies and toddlers, that when they are with one person for the better part of a day, that is the person they are used to - at that time. It has nothing to do with preferring someone over you. I have toddlers now, who cry like it's the end of the world when Mommy leaves in the morning, but as soon as she pulls out of the driveway, they are over it. When I leave at the end of the day, sometimes they say "goodbye" and sometimes they don't even care that I'm leaving. It's not personal! The great thing about children is they love the one they are with but there is no one like Mommy!