Normal childhood development has toddler-age in which children are exploring their bodies, seeing what is happening around them and learning to behave in stimuli. Here is a link to a very useful article from where you will get a lot of information: Normal childhood

Normal childhood means, a child brought up in family environment, receiving all the basic needs i.e. Food, shelter, parents, love, care, education, sports, etc etc.    Some children become victim of sexual abuse, violence, child labour and some are nurtured as an orphan. So they are considered as abnormal childhood.