My daughter is 2 next month. She has been going to nursery two days a week for thr past year, she usually loves nursery and smiles so much when she sees the building. However, the last four times she has had a meltdown when I drop her off, she doesn't want to let go of me and cries so much. There are lots of new staff but that is the only thing that has changed. Should I be worried that something has happened at the nursery? Or do you think it is just developmental?