Aussie Childcare Network Forum

Hi I was wondering if anyone can help? Iam currently doing my diploma in childcare and am stuck on a question.
Describe in detail the developmental reasons/influences on the following behaviours.
* biting,pushing hurting other children
* snatching toys not sharing
* crying and emotional upset when parents/families leave
* frustration at task
*toilet training
* self care

Thankyou so much this will help heaps.

biting, pushing, hurting other children
snatching toys not sharing
crying and emotional upset when parents/families leave
frustration at task
toilet training
self-care