My DD turned 21mo last week and has started to become clingy again at nursery drop offs. She's been going to the same nursery for about 12 months and there haven't been any changes in key worker/ nursery staff etc. No changes at home either. She was quite clingy when she first started nursery at drop offs but it eased within a couple of weeks. Can't get my head round why it's started up again. She's hanging onto our legs as we leave and has also started to cry when we go whereas previously she'd happily walk off and wave. Only change I can think of some of her friends have moved into the bigger room. She's due to move next month though.
Is there a developmental leap at this age? I used to follow wonder weeks and found it helpful but it stops at 18mo. Any ideas anyone?