Name Validation

Hi

  In below code i want Child Name should accept only Alphabets , space , spacebar & .

    
                
                    

        

            

                
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Lead Number
                
Lead Date
                
Name
                
Mobile No
                
Child Name
                
Child Age
            
        
        

            

                        

                            
                            
                        

                            
                        

                            
                        

                            
                        

                            
                        

                            
                        

                            
                    
                
            
        
    

Thanks