My helper has been with my baby since 3 months til now (13 months) and naturally, my baby loves the helper! I do feel sad and a bit jealous sometimes, but it is fleeting and I try to tell myself, if baby loves the helper means my helper is doing a great job and keeping my baby happy. When I go home from work, I spend all the time with her and we share a bed at night and I take care of her when she wakes up at night. She knows who her mummy is and I can tell she loves me, even though she spends more awake time with helper. Babies are smart, you should trust your baby and whenever you can, spend time talking to her, playing, reading, telling her how much you love her and give her lots of cuddles. I'm 100% certain there will be no mistaking who her mummy is :)
Natalie