Simone, don't be upset. My nearly three year old has been in nursery full time since she was 4 1/2 months. She's now at two different nurseries and loves it. Always has. She pushes us away in the morning. We're cramping her style! I don't read research papers. I just look at The children at my nursery and they're all happy, chatty, bouncy and confident little things. They're also firm friends and it's lovely getting to know the parents. Don't worry and do what feels right for you and your little one!