Mommy vs. Nanny: Battle for Kids' Affection

Overnight, Stacey Isaacs, 36, is a hands-on mother. But at 8 in the morning, Stacey switches off mommy mode, revs up for her job as a corporate lawyer and hands over her 3-month-old baby, Reese, to her baby sitter Alicia Apaestegui, 57.

It's Apaestegui, not Reese's parents, who will give the infant her first bottle of the day. The nanny will talk, sing and play with the baby for the next 10 hours while mommy's gone.

Like many first-time moms, Isaacs is torn between the career she's nurtured for years and the newborn baby who needs nurturing, too.

"It just feels bad to me to pass her over when I could be home taking care of her myself. I feel guilty when I'm leaving." Isaacs said.

She is also worried that when she's at work, she'll miss out on certain milestones like her baby's first words, her first walk and first laugh. And her worst nightmare? Isaacs says she fears that her daughter will come to prefer the nanny over time.

Ella Larson, 3, who has had baby sitters and been in day care since she was born, is not shy about telling her mother that she'd rather be with her nanny.

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During a family vacation in La Jolla, Calif., last week, Ella suddenly missed her live-in nanny Tia Sumption, 27, and began to throw a tantrum. "I want Tia!" Ella screamed. "No! No! Go away!" the little girl told her mother, Beth Larson, 36, as she was trying to calm her down. "What do you want? Tell mommy what you want?" Larson asked. "I want Tia!" Ella insisted.

"It's horrible. It's horrible. Part of me is so sad, but I'm so happy for her that she loves Tia," Larson said. She also has another daughter named Erin who is 11 months old.

By 6 every morning, Larson is juggling work and caring for her baby, while balancing feeding, e-mailing and playing. When Sumption shows up at 7, she takes over, and Larson is off and running, literally. She takes time out from the kids in the morning to run because she believes it helps her stay healthy and energetic all day.

"I love my kids. They're the most important thing in the world to me, yet I'm a strong, independent businesswoman, very independent. I like my own time. I like to do things for myself," Larson said.

She describes her mommy style as very hands on at times and then very hands off as well. "I feel bad about that, but I also realize that makes me who I am, and I want them to see who I am," Larson said.