You need to consider a number of factors: Verbal communication: Tone and pitch of your voice, does it suit the situation or topic? A louder more direct communication maybe required if trying to get the attention of a group of children to come back inside. However this would not be suitable in a situation whereby a child is upset say for example if they have wet themselves and are embarrassed, this would need a quieter and understanding tone to reassure them.
Use of language is important, when talking to children you need to keep things simpler than if you were walking to an adult, however if you talking to an adult using very simple instructions this may be deemed as patronising, so it is important to choose your language carefully. The speed in which you talk is also key. When talking to children I tend to get down to their level and talk to them at a relatively slow speed, this way they are more likely to understand me more than if I was walking round above them talking as though I would talk to adults.
Non-verbal communication: Facial and hand gestures, again this needs to be tailored to the situation or topic. In the example above, a smile and perhaps a hand on their shoulder is sufficient to the situation. Whereby frowning and waving arms as if annoyed would be detrimental to the feelings of the child. Eye contact is an important factor as this engages the audience, keeping them focused on what you are discussing.
By making eye contact you are directing your conversation at that specific person, demonstrating that you are devoting your time and are not able to be distracted as if you would by looking around. Body language plays an important part, for example folded arms can indicate you are being defensive or not open to suggestions, whereas slouching, hands on hips, rolling of eyes and huffing can seem rude and disrespectful. It is always advisable to evaluate a number of factors before communicating information:
What is the information I need to communicate? Who is my audience? Is written or verbal the best form of communication? What is the best time of day, at morning drop off or should I book some time in with the parent? Where should the communication take place, would it be appropriate to talk within ear reach of others or is the matter sensitive, therefore needing privacy. By considering the above, you are demonstrating professionalism and considering the needs of others.