DS just 3 has started 'big' nursery this week. He has really regressed with the potty training, LOADS of wet pants and now pooing too :( This has been the case at home too since starting. He has also been a bit up and down, tired and grumpy, fine the next. Sadly he did bite someone today. Teacher said it was very minor and he stopped himself (?? Not sure what she meant by this??) but even so I am gutted!